Finding the Fourth Proportional to 6,399.69, 8,831.28 and 3,566.91

Step by Step Solution

1. Step 1: Write the proportion equation
   6,399.69 : 8,831.28 = 3,566.91 : x
2. Step 2: Convert to fraction form
   6,399.69/8,831.28 = 3,566.91/x
3. Step 3: Cross multiply
   6,399.69x = 8,831.28 × 3,566.91
4. Step 4: Simplify right side
   6,399.69x = 31,500,380.94
5. Step 5: Solve for x
   x = 31,500,380.94/6,399.69
6. Step 6: Final answer
   x = 4,922.17