Finding the Fourth Proportional to 2,103.57, 3,151.31 and 1,128.33

Step by Step Solution

1. Step 1: Write the proportion equation
   2,103.57 : 3,151.31 = 1,128.33 : x
2. Step 2: Convert to fraction form
   2,103.57/3,151.31 = 1,128.33/x
3. Step 3: Cross multiply
   2,103.57x = 3,151.31 × 1,128.33
4. Step 4: Simplify right side
   2,103.57x = 3,555,711.97
5. Step 5: Solve for x
   x = 3,555,711.97/2,103.57
6. Step 6: Final answer
   x = 1,690.32