If the meaning of the symbol * is a * b = a.b/a + B, find 2 * 3 * 4

If the meaning of the symbol * is a * b = a.b/a + B, find 2 * 3 * 4

2*3*4
=(2x3)/(2+3)*4
=6/5x4
=(6/5x4)/(6/5+4)
=(24/5)/(26/5)
=12/13