\documentclass{article}
\begin{document}
\centerline{$\displaystyle 4.84 \times 10^8\textit{$m^3$} \...
\documentclass{article}
\begin{document}
\centerline{$\displaystyle 4.84 \times 10^8\textit{$m^3$} \cdot \frac{1000\textit{kg} } {$m^3$} $}
\end{document}
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