To solve for z in the equation (1.2 ÷ 0.04 = 3.7 ÷ z), first simplify the left side of the equation:

1.2 ÷ 0.04 = 30

Now, rewrite the equation as:

30 = 3.7 ÷ z

To solve for z, multiply both sides of the equation by z:

30z = 3.7

Now, isolate z by dividing both sides by 30:

z = 3.7 / 30
z = 0.12333

Therefore, z is approximately 0.12333.