Finding the Fourth Proportional to 8,498.78, 12,747.90 and 2,258.60

Step by Step Solution

1. Step 1: Write the proportion equation
   8,498.78 : 12,747.90 = 2,258.60 : x
2. Step 2: Convert to fraction form
   8,498.78/12,747.90 = 2,258.60/x
3. Step 3: Cross multiply
   8,498.78x = 12,747.90 × 2,258.60
4. Step 4: Simplify right side
   8,498.78x = 28,792,406.94
5. Step 5: Solve for x
   x = 28,792,406.94/8,498.78
6. Step 6: Final answer
   x = 3,387.83