Can You add it like that?

$\large \begin{aligned} 5 \circ 7\circ 4 & = 364730 \\ 9 \circ 6 \circ 3 & = 456990 \\ 8 \circ 2 \circ 9 & = 912672 \end{aligned}$

If the above holds true for all real numbers , find the value of $4 \circ 3 \circ 2$ .

Hint : Get a generalized idea for any numbers $a$ , $b$ , and $c$ and for the value of $a \circ b \circ c$ .