Finding the Fourth Proportional to 2,665.49, 3,997.76 and 717.89

Step by Step Solution

1. Step 1: Write the proportion equation
   2,665.49 : 3,997.76 = 717.89 : x
2. Step 2: Convert to fraction form
   2,665.49/3,997.76 = 717.89/x
3. Step 3: Cross multiply
   2,665.49x = 3,997.76 × 717.89
4. Step 4: Simplify right side
   2,665.49x = 2,869,928.35
5. Step 5: Solve for x
   x = 2,869,928.35/2,665.49
6. Step 6: Final answer
   x = 1,076.70