Finding the Fourth Proportional to 8,651.54, 12,978.44 and 3,105.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,651.54 : 12,978.44 = 3,105.50 : x
2. Step 2: Convert to fraction form
   8,651.54/12,978.44 = 3,105.50/x
3. Step 3: Cross multiply
   8,651.54x = 12,978.44 × 3,105.50
4. Step 4: Simplify right side
   8,651.54x = 40,304,545.42
5. Step 5: Solve for x
   x = 40,304,545.42/8,651.54
6. Step 6: Final answer
   x = 4,658.66