In the foreground of a side-view picture of a table, the legs touch the floor at a point that is \(12 \mathrm{~mm}\) from the bottom of the picture, and the tabletop is \(65 \mathrm{~mm}\) from the bottom of the picture. One end of the tabletop is \(14 \mathrm{~mm}\) from the left edge of the picture, and the other end is \(99 \mathrm{~mm}\) from the left edge. Estimate the actual length of the tabletop?