Find the Volume of the Solid Generated by Revolving the Region

Short Answer

Find the volume of the solid generated by revolving the region bounded by the graphs of the equations about the indicated axis. $$y = \frac { e ^ { x / 2 } } { \left( 1 + e ^ { x } \right) ^ { 5 / 2 } } , \quad y = 0 , \quad x = 0 , x = 4 \text {; the } x \text {-axis }$$