Finding the Fourth Proportional to 6,401.28, 9,540.24 and 6,391.56

Step by Step Solution

1. Step 1: Write the proportion equation
   6,401.28 : 9,540.24 = 6,391.56 : x
2. Step 2: Convert to fraction form
   6,401.28/9,540.24 = 6,391.56/x
3. Step 3: Cross multiply
   6,401.28x = 9,540.24 × 6,391.56
4. Step 4: Simplify right side
   6,401.28x = 60,977,016.37
5. Step 5: Solve for x
   x = 60,977,016.37/6,401.28
6. Step 6: Final answer
   x = 9,525.75