Finding the Fourth Proportional to 2,665.24, 3,997.58 and 717.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,665.24 : 3,997.58 = 717.20 : x
2. Step 2: Convert to fraction form
   2,665.24/3,997.58 = 717.20/x
3. Step 3: Cross multiply
   2,665.24x = 3,997.58 × 717.20
4. Step 4: Simplify right side
   2,665.24x = 2,867,064.38
5. Step 5: Solve for x
   x = 2,867,064.38/2,665.24
6. Step 6: Final answer
   x = 1,075.72