Finding the Fourth Proportional to 8,414.79, 12,617.78 and 3,145.47

Step by Step Solution

1. Step 1: Write the proportion equation
   8,414.79 : 12,617.78 = 3,145.47 : x
2. Step 2: Convert to fraction form
   8,414.79/12,617.78 = 3,145.47/x
3. Step 3: Cross multiply
   8,414.79x = 12,617.78 × 3,145.47
4. Step 4: Simplify right side
   8,414.79x = 39,688,832.73
5. Step 5: Solve for x
   x = 39,688,832.73/8,414.79
6. Step 6: Final answer
   x = 4,716.56