Answer
$4 \times 10^{15}$
Work Step by Step
Write the numerator and the denominator in scientific notation to obtain:
$=\dfrac{4.8 \times 10^{11}}{1.2 \times 10^{-4}}$
Divide the corresponding parts to obtain:
$=\dfrac{4.8}{1.2} \times \dfrac{10^{11}}{10^{-4}}
\\=4 \times 10^{11-(-4)}
\\=4 \times 10^{11+4}
\\=4 \times 10^{15}$
