Finding the Fourth Proportional to 71,500.82, 106,929.02 and 54,638.78

Step by Step Solution

1. Step 1: Write the proportion equation
   71,500.82 : 106,929.02 = 54,638.78 : x
2. Step 2: Convert to fraction form
   71,500.82/106,929.02 = 54,638.78/x
3. Step 3: Cross multiply
   71,500.82x = 106,929.02 × 54,638.78
4. Step 4: Simplify right side
   71,500.82x = 5,842,470,801.35
5. Step 5: Solve for x
   x = 5,842,470,801.35/71,500.82
6. Step 6: Final answer
   x = 81,711.95