Finding the Fourth Proportional to 72,151.33, 99,569.09 and 40,320.76

Step by Step Solution

1. Step 1: Write the proportion equation
   72,151.33 : 99,569.09 = 40,320.76 : x
2. Step 2: Convert to fraction form
   72,151.33/99,569.09 = 40,320.76/x
3. Step 3: Cross multiply
   72,151.33x = 99,569.09 × 40,320.76
4. Step 4: Simplify right side
   72,151.33x = 4,014,701,381.31
5. Step 5: Solve for x
   x = 4,014,701,381.31/72,151.33
6. Step 6: Final answer
   x = 55,642.79