Finding the Fourth Proportional to 71,171.30, 106,790.16 and 31,724.30

Step by Step Solution

1. Step 1: Write the proportion equation
   71,171.30 : 106,790.16 = 31,724.30 : x
2. Step 2: Convert to fraction form
   71,171.30/106,790.16 = 31,724.30/x
3. Step 3: Cross multiply
   71,171.30x = 106,790.16 × 31,724.30
4. Step 4: Simplify right side
   71,171.30x = 3,387,843,072.89
5. Step 5: Solve for x
   x = 3,387,843,072.89/71,171.30
6. Step 6: Final answer
   x = 47,601.25