Finding the Fourth Proportional to 2,023.38, 2,792.31 and 1,139.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,023.38 : 2,792.31 = 1,139.28 : x
2. Step 2: Convert to fraction form
   2,023.38/2,792.31 = 1,139.28/x
3. Step 3: Cross multiply
   2,023.38x = 2,792.31 × 1,139.28
4. Step 4: Simplify right side
   2,023.38x = 3,181,222.94
5. Step 5: Solve for x
   x = 3,181,222.94/2,023.38
6. Step 6: Final answer
   x = 1,572.23