Finding the Fourth Proportional to 6,399.46, 8,831.39 and 3,748.78

Step by Step Solution

1. Step 1: Write the proportion equation
   6,399.46 : 8,831.39 = 3,748.78 : x
2. Step 2: Convert to fraction form
   6,399.46/8,831.39 = 3,748.78/x
3. Step 3: Cross multiply
   6,399.46x = 8,831.39 × 3,748.78
4. Step 4: Simplify right side
   6,399.46x = 33,106,938.20
5. Step 5: Solve for x
   x = 33,106,938.20/6,399.46
6. Step 6: Final answer
   x = 5,173.40