Finding the Fourth Proportional to 72,105.48, 99,507.57 and 39,842.18

Step by Step Solution

1. Step 1: Write the proportion equation
   72,105.48 : 99,507.57 = 39,842.18 : x
2. Step 2: Convert to fraction form
   72,105.48/99,507.57 = 39,842.18/x
3. Step 3: Cross multiply
   72,105.48x = 99,507.57 × 39,842.18
4. Step 4: Simplify right side
   72,105.48x = 3,964,598,515.30
5. Step 5: Solve for x
   x = 3,964,598,515.30/72,105.48
6. Step 6: Final answer
   x = 54,983.32