Finding the Fourth Proportional to 71,609.38, 98,818.18 and 39,780.29

Step by Step Solution

1. Step 1: Write the proportion equation
   71,609.38 : 98,818.18 = 39,780.29 : x
2. Step 2: Convert to fraction form
   71,609.38/98,818.18 = 39,780.29/x
3. Step 3: Cross multiply
   71,609.38x = 98,818.18 × 39,780.29
4. Step 4: Simplify right side
   71,609.38x = 3,931,016,005.27
5. Step 5: Solve for x
   x = 3,931,016,005.27/71,609.38
6. Step 6: Final answer
   x = 54,895.27