Finding the Fourth Proportional to 72,081.76, 99,472.43 and 39,818.60

Step by Step Solution

1. Step 1: Write the proportion equation
   72,081.76 : 99,472.43 = 39,818.60 : x
2. Step 2: Convert to fraction form
   72,081.76/99,472.43 = 39,818.60/x
3. Step 3: Cross multiply
   72,081.76x = 99,472.43 × 39,818.60
4. Step 4: Simplify right side
   72,081.76x = 3,960,852,279.40
5. Step 5: Solve for x
   x = 3,960,852,279.40/72,081.76
6. Step 6: Final answer
   x = 54,949.44