Finding the Fourth Proportional to 2,665.86, 3,998.34 and 717.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,665.86 : 3,998.34 = 717.61 : x
2. Step 2: Convert to fraction form
   2,665.86/3,998.34 = 717.61/x
3. Step 3: Cross multiply
   2,665.86x = 3,998.34 × 717.61
4. Step 4: Simplify right side
   2,665.86x = 2,869,244.25
5. Step 5: Solve for x
   x = 2,869,244.25/2,665.86
6. Step 6: Final answer
   x = 1,076.29