The projection of the line segment joining the points (1, -1, 3) and (2, -4, 11) on the line joining the points (-1, 2, 3) and (3, -2, 10) is \ \ \ \.

The projection of the line segment joining the points ($\displaystyle 1$, -$\displaystyle 1$, $\displaystyle 3$) and ($\displaystyle 2$, -$\displaystyle 4$, $\displaystyle 11$) on the line joining the points (-$\displaystyle 1$, $\displaystyle 2$, $\displaystyle 3$) and ($\displaystyle 3$, -$\displaystyle 2$, $\displaystyle 10$) is \_\_\_\_.