Finding the Fourth Proportional to 2,023.40, 2,792.18 and 1,139.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,023.40 : 2,792.18 = 1,139.16 : x
2. Step 2: Convert to fraction form
   2,023.40/2,792.18 = 1,139.16/x
3. Step 3: Cross multiply
   2,023.40x = 2,792.18 × 1,139.16
4. Step 4: Simplify right side
   2,023.40x = 3,180,739.77
5. Step 5: Solve for x
   x = 3,180,739.77/2,023.40
6. Step 6: Final answer
   x = 1,571.98