Finding the Fourth Proportional to 8,789.72, 12,120.72 and 7,535.12

Step by Step Solution

1. Step 1: Write the proportion equation
   8,789.72 : 12,120.72 = 7,535.12 : x
2. Step 2: Convert to fraction form
   8,789.72/12,120.72 = 7,535.12/x
3. Step 3: Cross multiply
   8,789.72x = 12,120.72 × 7,535.12
4. Step 4: Simplify right side
   8,789.72x = 91,331,079.69
5. Step 5: Solve for x
   x = 91,331,079.69/8,789.72
6. Step 6: Final answer
   x = 10,390.67