An approximate solution is obtained to the three-dimensional equation of transport for a point source radiating along the Z-axis. The radiation is separated into scattered and unscattered components, and the transport equation for the scattered radiation is derived. The appropriate solution for the scattered radiation is obtained by expanding the intensity in tesseral harmonics and solving the resulting equations for the amplitude of each harmonic. Some numerical results are presented to illustrate the behavior of the solution at great depths of penetration.