Finding the Fourth Proportional to 115,147.57, 172,510.86 and 83,479.20

Step by Step Solution

1. Step 1: Write the proportion equation
   115,147.57 : 172,510.86 = 83,479.20 : x
2. Step 2: Convert to fraction form
   115,147.57/172,510.86 = 83,479.20/x
3. Step 3: Cross multiply
   115,147.57x = 172,510.86 × 83,479.20
4. Step 4: Simplify right side
   115,147.57x = 14,401,068,166.72
5. Step 5: Solve for x
   x = 14,401,068,166.72/115,147.57
6. Step 6: Final answer
   x = 125,066.19