Finding the Fourth Proportional to 8,321.62, 12,475.13 and 3,131.14

Step by Step Solution

1. Step 1: Write the proportion equation
   8,321.62 : 12,475.13 = 3,131.14 : x
2. Step 2: Convert to fraction form
   8,321.62/12,475.13 = 3,131.14/x
3. Step 3: Cross multiply
   8,321.62x = 12,475.13 × 3,131.14
4. Step 4: Simplify right side
   8,321.62x = 39,061,378.55
5. Step 5: Solve for x
   x = 39,061,378.55/8,321.62
6. Step 6: Final answer
   x = 4,693.96