Finding the Fourth Proportional to 2,023.31, 2,792.13 and 1,139.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,023.31 : 2,792.13 = 1,139.12 : x
2. Step 2: Convert to fraction form
   2,023.31/2,792.13 = 1,139.12/x
3. Step 3: Cross multiply
   2,023.31x = 2,792.13 × 1,139.12
4. Step 4: Simplify right side
   2,023.31x = 3,180,557.16
5. Step 5: Solve for x
   x = 3,180,557.16/2,023.31
6. Step 6: Final answer
   x = 1,571.96