Finding the Fourth Proportional to 2,661.15, 3,990.24 and 1,100.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661.15 : 3,990.24 = 1,100.28 : x
2. Step 2: Convert to fraction form
   2,661.15/3,990.24 = 1,100.28/x
3. Step 3: Cross multiply
   2,661.15x = 3,990.24 × 1,100.28
4. Step 4: Simplify right side
   2,661.15x = 4,390,381.27
5. Step 5: Solve for x
   x = 4,390,381.27/2,661.15
6. Step 6: Final answer
   x = 1,649.81