Finding the Fourth Proportional to 8,149.69, 12,215.31 and 5,618.59

Step by Step Solution

1. Step 1: Write the proportion equation
   8,149.69 : 12,215.31 = 5,618.59 : x
2. Step 2: Convert to fraction form
   8,149.69/12,215.31 = 5,618.59/x
3. Step 3: Cross multiply
   8,149.69x = 12,215.31 × 5,618.59
4. Step 4: Simplify right side
   8,149.69x = 68,632,757.54
5. Step 5: Solve for x
   x = 68,632,757.54/8,149.69
6. Step 6: Final answer
   x = 8,421.52