Finding the Fourth Proportional to 6,399.21, 8,831.55 and 3,567.05

Step by Step Solution

1. Step 1: Write the proportion equation
   6,399.21 : 8,831.55 = 3,567.05 : x
2. Step 2: Convert to fraction form
   6,399.21/8,831.55 = 3,567.05/x
3. Step 3: Cross multiply
   6,399.21x = 8,831.55 × 3,567.05
4. Step 4: Simplify right side
   6,399.21x = 31,502,536.27
5. Step 5: Solve for x
   x = 31,502,536.27/6,399.21
6. Step 6: Final answer
   x = 4,922.88