Finding the Fourth Proportional to 71,111.70, 106,696.20 and 31,641.72

Step by Step Solution

1. Step 1: Write the proportion equation
   71,111.70 : 106,696.20 = 31,641.72 : x
2. Step 2: Convert to fraction form
   71,111.70/106,696.20 = 31,641.72/x
3. Step 3: Cross multiply
   71,111.70x = 106,696.20 × 31,641.72
4. Step 4: Simplify right side
   71,111.70x = 3,376,051,285.46
5. Step 5: Solve for x
   x = 3,376,051,285.46/71,111.70
6. Step 6: Final answer
   x = 47,475.33