Finding the Fourth Proportional to 9,104.24, 12,561.72 and 7,111.28

Step by Step Solution

1. Step 1: Write the proportion equation
   9,104.24 : 12,561.72 = 7,111.28 : x
2. Step 2: Convert to fraction form
   9,104.24/12,561.72 = 7,111.28/x
3. Step 3: Cross multiply
   9,104.24x = 12,561.72 × 7,111.28
4. Step 4: Simplify right side
   9,104.24x = 89,329,908.20
5. Step 5: Solve for x
   x = 89,329,908.20/9,104.24
6. Step 6: Final answer
   x = 9,811.90