Finding the Fourth Proportional to 2,661.51, 3,989.95 and 1,100.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661.51 : 3,989.95 = 1,100.54 : x
2. Step 2: Convert to fraction form
   2,661.51/3,989.95 = 1,100.54/x
3. Step 3: Cross multiply
   2,661.51x = 3,989.95 × 1,100.54
4. Step 4: Simplify right side
   2,661.51x = 4,391,099.57
5. Step 5: Solve for x
   x = 4,391,099.57/2,661.51
6. Step 6: Final answer
   x = 1,649.85