Finding the Fourth Proportional to 72,111.20, 99,372.87 and 51,929.95

Step by Step Solution

1. Step 1: Write the proportion equation
   72,111.20 : 99,372.87 = 51,929.95 : x
2. Step 2: Convert to fraction form
   72,111.20/99,372.87 = 51,929.95/x
3. Step 3: Cross multiply
   72,111.20x = 99,372.87 × 51,929.95
4. Step 4: Simplify right side
   72,111.20x = 5,160,428,170.46
5. Step 5: Solve for x
   x = 5,160,428,170.46/72,111.20
6. Step 6: Final answer
   x = 71,562.09