What is the maximum distance of a stable brick stack without overhang?

[kamikaze1]

Homework Statement

There are four identical uniform bricks each with length of L, so that the top brick is as far to the right as possible without the stack falling over. Is it possible to stack the bridge such that no part of the top brick is over the table. Namely, maximize the distance of d (from the outer edge of the top brick to the outer edge of the table).

Homework Equations

torque
T=Fd
Center of mass

The Attempt at a Solution

First look at one brick, the maximum distance from the center of mass is L/2. I'm stuck there. How should I apply torque to know what happens if we put extra bricks on top?

 

[physicsvalk]

Try to examine how the center of mass of the system changes as you continuously stack blocks. Where should the center of mass be of the system for the blocks to fall?

 

[kamikaze1]

How would the center of mass change if I stack two bricks on each other?