Finding the Fourth Proportional to 10,689.20, 14,745.72 and 7,152.56

Step by Step Solution

1. Step 1: Write the proportion equation
   10,689.20 : 14,745.72 = 7,152.56 : x
2. Step 2: Convert to fraction form
   10,689.20/14,745.72 = 7,152.56/x
3. Step 3: Cross multiply
   10,689.20x = 14,745.72 × 7,152.56
4. Step 4: Simplify right side
   10,689.20x = 105,469,647.04
5. Step 5: Solve for x
   x = 105,469,647.04/10,689.20
6. Step 6: Final answer
   x = 9,866.94