Finding the Fourth Proportional to 2,023.36, 2,792.18 and 1,139.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,023.36 : 2,792.18 = 1,139.20 : x
2. Step 2: Convert to fraction form
   2,023.36/2,792.18 = 1,139.20/x
3. Step 3: Cross multiply
   2,023.36x = 2,792.18 × 1,139.20
4. Step 4: Simplify right side
   2,023.36x = 3,180,851.46
5. Step 5: Solve for x
   x = 3,180,851.46/2,023.36
6. Step 6: Final answer
   x = 1,572.06