In a geometric sequence, the $23$rd term is $16$ and the $26$th term is $18$. What is the $24$th term?

18 / 16 = r^3

9 / 8 = r^3

r = (9/8)^(1/3)

24th term = 16 * (9/8)^(1/3) ≈ 16.64