Finding the Fourth Proportional to 11,022.24, 15,120.72 and 10,689.28

Step by Step Solution

1. Step 1: Write the proportion equation
   11,022.24 : 15,120.72 = 10,689.28 : x
2. Step 2: Convert to fraction form
   11,022.24/15,120.72 = 10,689.28/x
3. Step 3: Cross multiply
   11,022.24x = 15,120.72 × 10,689.28
4. Step 4: Simplify right side
   11,022.24x = 161,629,609.88
5. Step 5: Solve for x
   x = 161,629,609.88/11,022.24
6. Step 6: Final answer
   x = 14,663.95