Finding the Fourth Proportional to 2,274.89, 3,139.02 and 1,280.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,274.89 : 3,139.02 = 1,280.12 : x
2. Step 2: Convert to fraction form
   2,274.89/3,139.02 = 1,280.12/x
3. Step 3: Cross multiply
   2,274.89x = 3,139.02 × 1,280.12
4. Step 4: Simplify right side
   2,274.89x = 4,018,306.59
5. Step 5: Solve for x
   x = 4,018,306.59/2,274.89
6. Step 6: Final answer
   x = 1,766.38