California Code, Government Code - GOV § 57143

(a) First, the per capita assessed value of land for each registered voter within the county within which the elections are held shall be determined to the nearest even dollar by dividing the total assessed value of land within the county, as shown on the last equalized assessment roll of the county, by the total number of voters who were registered in the county at the close of registration, as provided in the Elections Code, next preceding the date of the election. If any landowner-voter district is located in more than one county, the per capita assessed value for each county shall be multiplied by a percentage, to the nearest one-tenth of 1 percent, those percentages being determined by dividing the total area of the district into the area of those portions of the district located within that county; the resulting products of those multiplications shall then be added and the total, to the nearest even dollar, shall be deemed to be the per capita assessed value for all the counties.

(b) Second, if any such landowner-voter district does not use the county assessment roll for the purposes of levying and collecting district assessments or taxes, the per capita assessed value of land for each registered voter within the county shall be corrected by multiplying the per capita assessed value by a correction factor determined as follows: The total assessed valuation of all lands within the district, as shown upon the last equalized assessment roll or book of the district, shall be divided by the corresponding total assessed valuation of all lands within the district, as shown upon the last equalized assessment roll of the county, and the quotient, expressed to the nearest of two decimal places, shall represent the correction factor. If any landowner-voter district is located in more than one county, a correction factor shall be determined, in the manner above provided, for each such county covering all those portions of the district which are located within the county; the correction factor for each county shall then be multiplied by a percentage, to the nearest one-tenth of 1 percent, that percentage being determined by dividing the total area of the district into the area of those portions of the district located within that county; the resulting products of those multiplications shall then be added and the total, to the nearest of two decimal places, shall be deemed to be the correction factor for all the counties.

(c) Third, the corrected per capita assessed value, determined to the nearest even dollar, shall then be adjusted by dividing it by the number of dollars required for a single vote by a landowner-voter, as specified in the principal act determining the landowner-voter's right to vote.

(d) Fourth, the total number of votes cast by landowner-voters for and against the question shall be divided by the corrected and adjusted per capita assessed value and the quotients, to the nearest whole figures, shall be deemed to be the number of votes of landowner-voters which shall be equated with the votes of the registered-voters of any city or registered voter district, cast for and against the question.