Finding the Fourth Proportional to 8,662.56, 12,998.18 and 3,117.15

Step by Step Solution

1. Step 1: Write the proportion equation
   8,662.56 : 12,998.18 = 3,117.15 : x
2. Step 2: Convert to fraction form
   8,662.56/12,998.18 = 3,117.15/x
3. Step 3: Cross multiply
   8,662.56x = 12,998.18 × 3,117.15
4. Step 4: Simplify right side
   8,662.56x = 40,517,276.79
5. Step 5: Solve for x
   x = 40,517,276.79/8,662.56
6. Step 6: Final answer
   x = 4,677.29