Finding the Fourth Proportional to 8,318.16, 12,477.12 and 2,478.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,318.16 : 12,477.12 = 2,478.72 : x
2. Step 2: Convert to fraction form
   8,318.16/12,477.12 = 2,478.72/x
3. Step 3: Cross multiply
   8,318.16x = 12,477.12 × 2,478.72
4. Step 4: Simplify right side
   8,318.16x = 30,927,286.89
5. Step 5: Solve for x
   x = 30,927,286.89/8,318.16
6. Step 6: Final answer
   x = 3,718.04