Finding an unknown in a formula

A frustum-shaped glass has height 12 cm. The radius of the base is 3 cm and the radius of the top opening is 4 cm.

Using the volume formula for a frustum of a cone, $V = \dfrac{1}{3}\pi h(R^2 + Rr + r^2)$, find the volume of the glass in $\text{cm}^3$, correct to 1 decimal place.