Finding the Fourth Proportional to 8,771.28, 12,103.20 and 5,631.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,771.28 : 12,103.20 = 5,631.72 : x
2. Step 2: Convert to fraction form
   8,771.28/12,103.20 = 5,631.72/x
3. Step 3: Cross multiply
   8,771.28x = 12,103.20 × 5,631.72
4. Step 4: Simplify right side
   8,771.28x = 68,161,833.50
5. Step 5: Solve for x
   x = 68,161,833.50/8,771.28
6. Step 6: Final answer
   x = 7,771.02