Finding the Fourth Proportional to 2,665.36, 3,997.86 and 717.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,665.36 : 3,997.86 = 717.40 : x
2. Step 2: Convert to fraction form
   2,665.36/3,997.86 = 717.40/x
3. Step 3: Cross multiply
   2,665.36x = 3,997.86 × 717.40
4. Step 4: Simplify right side
   2,665.36x = 2,868,064.76
5. Step 5: Solve for x
   x = 2,868,064.76/2,665.36
6. Step 6: Final answer
   x = 1,076.05