The governing body of a fire district established pursuant to Kan. Stat. Ann. § 19-3624, shall annually file the budget of the benefit district with the clerk of the county in which the greater portion of the district is located; and the county clerk of any other county in which any territory of the district is located shall annually, on or before August 25, certify the total amount of assessed taxable tangible property in such benefit district located in such county to the clerk of the county in which the greater portion of the district is located. Thereafter, the county clerk of the county in which the governing body of the district is located shall determine the rate of tax necessary to be levied for such benefit district to finance that portion of the budget to be derived from ad valorem taxes, but such rate shall in no case exceed five mills upon the taxable tangible property in the benefit district. Upon determination of the rate of levy, the county clerk of the county in which the governing body of the district is located shall certify the same to the county clerk of each of the counties in which some portion of the benefit district lies. It shall be the duty of the board of county commissioners of the counties where any territory of the benefit district lies to levy the tax upon the taxable tangible property in such benefit district. The tax levy authorized by this section shall be in addition to all other tax levies authorized or limited by law.