Answer
$6312000 \ ft^3$
Work Step by Step
The volume of a square pyramid is:
$Volume =\dfrac{1}{2} \times b\times h=\dfrac{1}{2} \times S^2 \times h$
Plug the values of $S$ and $h$ into the formula to obtain:
$Volume=\dfrac{1}{2} \times (149)^2 \times (853)\\=\dfrac{1}{2} \times 22201 \times 853 \\=6312000 \ ft^3$