Finding the Fourth Proportional to 8,086.80, 12,128.16 and 5,739.92

Step by Step Solution

1. Step 1: Write the proportion equation
   8,086.80 : 12,128.16 = 5,739.92 : x
2. Step 2: Convert to fraction form
   8,086.80/12,128.16 = 5,739.92/x
3. Step 3: Cross multiply
   8,086.80x = 12,128.16 × 5,739.92
4. Step 4: Simplify right side
   8,086.80x = 69,614,668.15
5. Step 5: Solve for x
   x = 69,614,668.15/8,086.80
6. Step 6: Final answer
   x = 8,608.43