Finding the Fourth Proportional to 12,666.38, 17,479.60 and 7,077.38

Step by Step Solution

1. Step 1: Write the proportion equation
   12,666.38 : 17,479.60 = 7,077.38 : x
2. Step 2: Convert to fraction form
   12,666.38/17,479.60 = 7,077.38/x
3. Step 3: Cross multiply
   12,666.38x = 17,479.60 × 7,077.38
4. Step 4: Simplify right side
   12,666.38x = 123,709,666.36
5. Step 5: Solve for x
   x = 123,709,666.36/12,666.38
6. Step 6: Final answer
   x = 9,766.78