How do you simplify (8.6times10^4)/(2times10^-6)?

$\frac{8.6 \times {10}^{4}}{2 \times {10}^{-} 6} = \frac{8.6}{2} \times {10}^{4} / {10}^{-} 6 = 4.3 \times {10}^{4 - \left(- 6\right)} =$
$4.3 \times {10}^{4 + 6} = 4.3 \times {10}^{10}$