Finding the Fourth Proportional to 72,151.80, 99,569.25 and 40,320.69

Step by Step Solution

1. Step 1: Write the proportion equation
   72,151.80 : 99,569.25 = 40,320.69 : x
2. Step 2: Convert to fraction form
   72,151.80/99,569.25 = 40,320.69/x
3. Step 3: Cross multiply
   72,151.80x = 99,569.25 × 40,320.69
4. Step 4: Simplify right side
   72,151.80x = 4,014,700,862.78
5. Step 5: Solve for x
   x = 4,014,700,862.78/72,151.80
6. Step 6: Final answer
   x = 55,642.42