Finding the Fourth Proportional to 2,023.68, 2,792.72 and 1,139.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,023.68 : 2,792.72 = 1,139.60 : x
2. Step 2: Convert to fraction form
   2,023.68/2,792.72 = 1,139.60/x
3. Step 3: Cross multiply
   2,023.68x = 2,792.72 × 1,139.60
4. Step 4: Simplify right side
   2,023.68x = 3,182,583.71
5. Step 5: Solve for x
   x = 3,182,583.71/2,023.68
6. Step 6: Final answer
   x = 1,572.67