Finding the Fourth Proportional to 71,643.38, 98,864.88 and 39,812

Step by Step Solution

1. Step 1: Write the proportion equation
   71,643.38 : 98,864.88 = 39,812 : x
2. Step 2: Convert to fraction form
   71,643.38/98,864.88 = 39,812/x
3. Step 3: Cross multiply
   71,643.38x = 98,864.88 × 39,812
4. Step 4: Simplify right side
   71,643.38x = 3,936,008,602.56
5. Step 5: Solve for x
   x = 3,936,008,602.56/71,643.38
6. Step 6: Final answer
   x = 54,938.90