If the functions of a dissolved district are not continued, all funds remaining in the treasury of the district in excess of indebtedness, upon completion of the requirements for dissolution, and all taxes paid after dissolution, shall be divided among the municipalities and counties in which the district exists, pro rata, as the latest confirmed assessed value of the taxable property in the parts of the district lying in each municipality and each unincorporated portion of each county bear [bears] to the total latest confirmed assessed value of the taxable property in the district.