Finding the Fourth Proportional to 12,743.40, 17,581.49 and 7,960.08

Step by Step Solution

1. Step 1: Write the proportion equation
   12,743.40 : 17,581.49 = 7,960.08 : x
2. Step 2: Convert to fraction form
   12,743.40/17,581.49 = 7,960.08/x
3. Step 3: Cross multiply
   12,743.40x = 17,581.49 × 7,960.08
4. Step 4: Simplify right side
   12,743.40x = 139,950,131.87
5. Step 5: Solve for x
   x = 139,950,131.87/12,743.40
6. Step 6: Final answer
   x = 10,982.17