Finding the Fourth Proportional to 9,509.72, 13,123.32 and 5,531

Step by Step Solution

1. Step 1: Write the proportion equation
   9,509.72 : 13,123.32 = 5,531 : x
2. Step 2: Convert to fraction form
   9,509.72/13,123.32 = 5,531/x
3. Step 3: Cross multiply
   9,509.72x = 13,123.32 × 5,531
4. Step 4: Simplify right side
   9,509.72x = 72,585,082.92
5. Step 5: Solve for x
   x = 72,585,082.92/9,509.72
6. Step 6: Final answer
   x = 7,632.73