Finding the Fourth Proportional to 12,609.72, 17,399.34 and 7,641.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,609.72 : 17,399.34 = 7,641.72 : x
2. Step 2: Convert to fraction form
   12,609.72/17,399.34 = 7,641.72/x
3. Step 3: Cross multiply
   12,609.72x = 17,399.34 × 7,641.72
4. Step 4: Simplify right side
   12,609.72x = 132,960,884.46
5. Step 5: Solve for x
   x = 132,960,884.46/12,609.72
6. Step 6: Final answer
   x = 10,544.32