Answer
$\frac{x^{3}y^{4}}{4}$
Work Step by Step
$\frac{3x^{4}y^{10}}{12xy^{6}}=\frac{3}{12}\times\frac{x^{4}}{x}\times\frac{y^{10}}{y^{6}}=\frac{3\div3}{12\div3}\times x^{4-1}\times y^{10-6}=\frac{1}{4}\times x^{3}\times y^{4}=\frac{x^{3}y^{4}}{4}$