Divide $\frac{I\left(a^{4}y^{-2}\right)^{-3}}{\left(b^{4}x^{-1}\right)^{-3}}$ by $\frac{a^{-2}b^{4}}{x^{-3}y^{2}}$ by multiplying $\frac{I\left(a^{4}y^{-2}\right)^{-3}}{\left(b^{4}x^{-1}\right)^{-3}}$ by the reciprocal of $\frac{a^{-2}b^{4}}{x^{-3}y^{2}}$.
Divide $\frac{I\left(a^{4}y^{-2}\right)^{-3}}{\left(b^{4}x^{-1}\right)^{-3}}$ by $\frac{a^{-2}b^{4}}{x^{-3}y^{2}}$ by multiplying $\frac{I\left(a^{4}y^{-2}\right)^{-3}}{\left(b^{4}x^{-1}\right)^{-3}}$ by the reciprocal of $\frac{a^{-2}b^{4}}{x^{-3}y^{2}}$.