Answer:
17,714.7
Explanation:
a_n = 3^(2 n - 1) 10^(5 - n) (for all terms given)
{30000, 27000, 24300, 21870, 19683, 177147/10, 1594323/100, 14348907/1000, 129140163/10000, 1162261467/100000, 10460353203/1000000, 94143178827/10000000, 847288609443/100000000, 7625597484987/1000000000, 68630377364883/10000000000, 617673396283947/100000000000}