Finding the Fourth Proportional to 72,221.28, 99,669.24 and 40,388.28

Step by Step Solution

1. Step 1: Write the proportion equation
   72,221.28 : 99,669.24 = 40,388.28 : x
2. Step 2: Convert to fraction form
   72,221.28/99,669.24 = 40,388.28/x
3. Step 3: Cross multiply
   72,221.28x = 99,669.24 × 40,388.28
4. Step 4: Simplify right side
   72,221.28x = 4,025,469,172.51
5. Step 5: Solve for x
   x = 4,025,469,172.51/72,221.28
6. Step 6: Final answer
   x = 55,737.99