Finding the Fourth Proportional to 86,285.76, 129,404.89 and 54,648.37

Step by Step Solution

1. Step 1: Write the proportion equation
   86,285.76 : 129,404.89 = 54,648.37 : x
2. Step 2: Convert to fraction form
   86,285.76/129,404.89 = 54,648.37/x
3. Step 3: Cross multiply
   86,285.76x = 129,404.89 × 54,648.37
4. Step 4: Simplify right side
   86,285.76x = 7,071,766,538.60
5. Step 5: Solve for x
   x = 7,071,766,538.60/86,285.76
6. Step 6: Final answer
   x = 81,957.52