Finding the Fourth Proportional to 10,002.72, 13,771.44 and 8,231.28

Step by Step Solution

1. Step 1: Write the proportion equation
   10,002.72 : 13,771.44 = 8,231.28 : x
2. Step 2: Convert to fraction form
   10,002.72/13,771.44 = 8,231.28/x
3. Step 3: Cross multiply
   10,002.72x = 13,771.44 × 8,231.28
4. Step 4: Simplify right side
   10,002.72x = 113,356,578.64
5. Step 5: Solve for x
   x = 113,356,578.64/10,002.72
6. Step 6: Final answer
   x = 11,332.58