Squrare Sum

$9^{2}=a^{2}+b^{2}+c^{2}+d^{2}$

If all $a,b,c$ and $d$ are positive integers, find $a,b,c$ and $d$ .

Details and Assumptions

• $a,b,c$ and $d$ are distinct
• Enter the answer as $a \times b \times c \times d$