Finding the Fourth Proportional to 6,399.15, 8,831.54 and 3,566.78

Step by Step Solution

1. Step 1: Write the proportion equation
   6,399.15 : 8,831.54 = 3,566.78 : x
2. Step 2: Convert to fraction form
   6,399.15/8,831.54 = 3,566.78/x
3. Step 3: Cross multiply
   6,399.15x = 8,831.54 × 3,566.78
4. Step 4: Simplify right side
   6,399.15x = 31,500,191.24
5. Step 5: Solve for x
   x = 31,500,191.24/6,399.15
6. Step 6: Final answer
   x = 4,922.56