Finding the Fourth Proportional to 12,673.80, 17,487.06 and 7,960.20

Step by Step Solution

1. Step 1: Write the proportion equation
   12,673.80 : 17,487.06 = 7,960.20 : x
2. Step 2: Convert to fraction form
   12,673.80/17,487.06 = 7,960.20/x
3. Step 3: Cross multiply
   12,673.80x = 17,487.06 × 7,960.20
4. Step 4: Simplify right side
   12,673.80x = 139,200,495.01
5. Step 5: Solve for x
   x = 139,200,495.01/12,673.80
6. Step 6: Final answer
   x = 10,983.33