Solve the below equation. 173.5 x 177.3 ÷ 174.2 = 17?

17^3.5 x 17^7.3 ÷ 17^4.2 = 17^?
Apply the Laws of Exponents ::
(a^m) x (aⁿ) = a^m+n
Fractional Exponents ::
a^m÷ a ⁿ=a^m?n
⇒ 17^{3.5 + 7.3 - 4.2} = 17^?
⇒ 17^6.6 = 17^?
∴ ? = 6.6