Finding the Fourth Proportional to 71,705.74, 98,945.90 and 39,872.74

Step by Step Solution

1. Step 1: Write the proportion equation
   71,705.74 : 98,945.90 = 39,872.74 : x
2. Step 2: Convert to fraction form
   71,705.74/98,945.90 = 39,872.74/x
3. Step 3: Cross multiply
   71,705.74x = 98,945.90 × 39,872.74
4. Step 4: Simplify right side
   71,705.74x = 3,945,244,144.77
5. Step 5: Solve for x
   x = 3,945,244,144.77/71,705.74
6. Step 6: Final answer
   x = 55,019.92