Finding the Fourth Proportional to 2,687.37, 4,028.15 and 1,128.23

Step by Step Solution

1. Step 1: Write the proportion equation
   2,687.37 : 4,028.15 = 1,128.23 : x
2. Step 2: Convert to fraction form
   2,687.37/4,028.15 = 1,128.23/x
3. Step 3: Cross multiply
   2,687.37x = 4,028.15 × 1,128.23
4. Step 4: Simplify right side
   2,687.37x = 4,544,653.89
5. Step 5: Solve for x
   x = 4,544,653.89/2,687.37
6. Step 6: Final answer
   x = 1,691.12