Finding the Fourth Proportional to 12,666.72, 17,480.02 and 7,077.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,666.72 : 17,480.02 = 7,077.72 : x
2. Step 2: Convert to fraction form
   12,666.72/17,480.02 = 7,077.72/x
3. Step 3: Cross multiply
   12,666.72x = 17,480.02 × 7,077.72
4. Step 4: Simplify right side
   12,666.72x = 123,718,687.15
5. Step 5: Solve for x
   x = 123,718,687.15/12,666.72
6. Step 6: Final answer
   x = 9,767.22