\[\frac{\left( 2x^{3} \right)^{5} \bullet \left( 2x^{2} \right)^{4}}{\left( 4x^{5} \right)^{4}} = 54\]
\[\frac{2^{5} \bullet x^{15} \bullet 2^{4} \bullet x^{8}}{2^{8}x^{20}} = 54\]
\[\frac{2^{9} \bullet x^{23}}{2^{8} \bullet x^{20}} = 54\]
\[2x³ = 54\ \ \ \ |\ :2\]
\[x^{3} = 27\]
\[x = 3.\]