Finding the Fourth Proportional to 71,300.40, 106,864.20 and 31,815.60

Step by Step Solution

1. Step 1: Write the proportion equation
   71,300.40 : 106,864.20 = 31,815.60 : x
2. Step 2: Convert to fraction form
   71,300.40/106,864.20 = 31,815.60/x
3. Step 3: Cross multiply
   71,300.40x = 106,864.20 × 31,815.60
4. Step 4: Simplify right side
   71,300.40x = 3,399,948,641.52
5. Step 5: Solve for x
   x = 3,399,948,641.52/71,300.40
6. Step 6: Final answer
   x = 47,684.85