Finding the Fourth Proportional to 2,665.56, 3,998.60 and 717.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,665.56 : 3,998.60 = 717.96 : x
2. Step 2: Convert to fraction form
   2,665.56/3,998.60 = 717.96/x
3. Step 3: Cross multiply
   2,665.56x = 3,998.60 × 717.96
4. Step 4: Simplify right side
   2,665.56x = 2,870,834.86
5. Step 5: Solve for x
   x = 2,870,834.86/2,665.56
6. Step 6: Final answer
   x = 1,077.01