Finding the Fourth Proportional to 72,005.59, 99,366.96 and 39,740.50

Step by Step Solution

1. Step 1: Write the proportion equation
   72,005.59 : 99,366.96 = 39,740.50 : x
2. Step 2: Convert to fraction form
   72,005.59/99,366.96 = 39,740.50/x
3. Step 3: Cross multiply
   72,005.59x = 99,366.96 × 39,740.50
4. Step 4: Simplify right side
   72,005.59x = 3,948,892,673.88
5. Step 5: Solve for x
   x = 3,948,892,673.88/72,005.59
6. Step 6: Final answer
   x = 54,841.47