Finding the Fourth Proportional to 72,134.17, 99,550.31 and 39,868.09

Step by Step Solution

1. Step 1: Write the proportion equation
   72,134.17 : 99,550.31 = 39,868.09 : x
2. Step 2: Convert to fraction form
   72,134.17/99,550.31 = 39,868.09/x
3. Step 3: Cross multiply
   72,134.17x = 99,550.31 × 39,868.09
4. Step 4: Simplify right side
   72,134.17x = 3,968,880,788.40
5. Step 5: Solve for x
   x = 3,968,880,788.40/72,134.17
6. Step 6: Final answer
   x = 55,020.82