Super Hard

$\begin{array}{| *5{@{}c@{}|}} \hline \qquad & \qquad & \qquad & \textcolor{red}{\heartsuit} & \qquad \\ \hline & 74 & & \qquad & \\ \hline & & & & 186 \\ \hline & & 103 & & \\ \hline 0 & & & & \\ \hline \end{array}$

It is possible to place positive integers into the vacant twenty-one squares of this $5 \times 5$ grid so that the numbers in each row and column form an arithmetic sequence. Find the number that must occupy the vacant square marked by the $\textcolor{red}{\heartsuit}$.