Answer
$V = \frac{44800}{3}\pi \approx 46891 \text{ cubic inches}$
Work Step by Step
RECALL:
The volume $V$ of a cone is given by the formula $V=\frac{1}{3}\pi{r^2h}$ where r = radius and h = height.
The given cone has:
r = 40 inches
h = 28 inches
Use the formula above to obtain:
$V=\frac{1}{3} \pi(40^2)(28)
\\V= \frac{1}{3}\pi(1600)(28)
\\V = \frac{1}{3}(44800)
\\V = \frac{44800}{3}\pi
\\V \approx 46891 \text{ cubic inches}$