\textbf{126.} The bases of a trapezoid measure 5 and 9 units. We draw a line segment parallel to the bases of the trapezoid that divides it into two parts of equal area. What is the length of this segment?
\begin{itemize}
\item[(1)] 7
\item[(2)] $\sqrt{53}$
\item[(3)] $4\sqrt{3}$
\item[(4)] $\sqrt{57}$
\end{itemize}