Finding the Fourth Proportional to 72,104.98, 99,504.29 and 39,839.50

Step by Step Solution

1. Step 1: Write the proportion equation
   72,104.98 : 99,504.29 = 39,839.50 : x
2. Step 2: Convert to fraction form
   72,104.98/99,504.29 = 39,839.50/x
3. Step 3: Cross multiply
   72,104.98x = 99,504.29 × 39,839.50
4. Step 4: Simplify right side
   72,104.98x = 3,964,201,161.46
5. Step 5: Solve for x
   x = 3,964,201,161.46/72,104.98
6. Step 6: Final answer
   x = 54,978.19