Finding the Fourth Proportional to 2,103.66, 3,155.76 and 1,128.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.66 : 3,155.76 = 1,128.42 : x
2. Step 2: Convert to fraction form
   2,103.66/3,155.76 = 1,128.42/x
3. Step 3: Cross multiply
   2,103.66x = 3,155.76 × 1,128.42
4. Step 4: Simplify right side
   2,103.66x = 3,561,022.70
5. Step 5: Solve for x
   x = 3,561,022.70/2,103.66
6. Step 6: Final answer
   x = 1,692.77