Finding the Fourth Proportional to 8,957.31, 12,360.15 and 5,179.89

Step by Step Solution

1. Step 1: Write the proportion equation
   8,957.31 : 12,360.15 = 5,179.89 : x
2. Step 2: Convert to fraction form
   8,957.31/12,360.15 = 5,179.89/x
3. Step 3: Cross multiply
   8,957.31x = 12,360.15 × 5,179.89
4. Step 4: Simplify right side
   8,957.31x = 64,024,217.38
5. Step 5: Solve for x
   x = 64,024,217.38/8,957.31
6. Step 6: Final answer
   x = 7,147.71