Finding the Fourth Proportional to 8,651.13, 12,978.52 and 2,807.29

Step by Step Solution

1. Step 1: Write the proportion equation
   8,651.13 : 12,978.52 = 2,807.29 : x
2. Step 2: Convert to fraction form
   8,651.13/12,978.52 = 2,807.29/x
3. Step 3: Cross multiply
   8,651.13x = 12,978.52 × 2,807.29
4. Step 4: Simplify right side
   8,651.13x = 36,434,404.52
5. Step 5: Solve for x
   x = 36,434,404.52/8,651.13
6. Step 6: Final answer
   x = 4,211.52