Finding the Fourth Proportional to 71,721.63, 98,978.58 and 39,892.83

Step by Step Solution

1. Step 1: Write the proportion equation
   71,721.63 : 98,978.58 = 39,892.83 : x
2. Step 2: Convert to fraction form
   71,721.63/98,978.58 = 39,892.83/x
3. Step 3: Cross multiply
   71,721.63x = 98,978.58 × 39,892.83
4. Step 4: Simplify right side
   71,721.63x = 3,948,535,665.58
5. Step 5: Solve for x
   x = 3,948,535,665.58/71,721.63
6. Step 6: Final answer
   x = 55,053.62