Finding the Fourth Proportional to 2,665.80, 3,997.89 and 1,105.74

Step by Step Solution

1. Step 1: Write the proportion equation
   2,665.80 : 3,997.89 = 1,105.74 : x
2. Step 2: Convert to fraction form
   2,665.80/3,997.89 = 1,105.74/x
3. Step 3: Cross multiply
   2,665.80x = 3,997.89 × 1,105.74
4. Step 4: Simplify right side
   2,665.80x = 4,420,626.89
5. Step 5: Solve for x
   x = 4,420,626.89/2,665.80
6. Step 6: Final answer
   x = 1,658.27