Finding the Fourth Proportional to 2,274.78, 3,139.18 and 1,280.24

Step by Step Solution

1. Step 1: Write the proportion equation
   2,274.78 : 3,139.18 = 1,280.24 : x
2. Step 2: Convert to fraction form
   2,274.78/3,139.18 = 1,280.24/x
3. Step 3: Cross multiply
   2,274.78x = 3,139.18 × 1,280.24
4. Step 4: Simplify right side
   2,274.78x = 4,018,903.80
5. Step 5: Solve for x
   x = 4,018,903.80/2,274.78
6. Step 6: Final answer
   x = 1,766.72