Fire protection districts additionally are authorized to incur general indebtedness for capital purposes and to issue general obligation bonds not to exceed an amount, together with any outstanding general obligation indebtedness, equal to three-fourths of one percent of the value of the taxable property within such district, as the term "value of the taxable property" is defined in RCW
39.36.015, and to provide for the retirement thereof by excess property tax levies, when the voters of the district have approved a proposition authorizing such indebtedness and levies by an affirmative vote of three-fifths of those voting on the proposition at such election, at which election the total number of persons voting shall constitute not less than forty percent of the voters in the fire protection district who voted at the last preceding general state election. The maximum term of such bonds may not exceed twenty years. Such bonds shall be issued and sold in accordance with chapter
39.46 RCW. Such elections shall be held as provided in RCW
39.36.050.