Finding the Fourth Proportional to 115,131.50, 172,689.33 and 70,765.10

Step by Step Solution

1. Step 1: Write the proportion equation
   115,131.50 : 172,689.33 = 70,765.10 : x
2. Step 2: Convert to fraction form
   115,131.50/172,689.33 = 70,765.10/x
3. Step 3: Cross multiply
   115,131.50x = 172,689.33 × 70,765.10
4. Step 4: Simplify right side
   115,131.50x = 12,220,377,706.38
5. Step 5: Solve for x
   x = 12,220,377,706.38/115,131.50
6. Step 6: Final answer
   x = 106,142.78