Finding the Fourth Proportional to 2,275.49, 3,140.17 and 1,280.68

Step by Step Solution

1. Step 1: Write the proportion equation
   2,275.49 : 3,140.17 = 1,280.68 : x
2. Step 2: Convert to fraction form
   2,275.49/3,140.17 = 1,280.68/x
3. Step 3: Cross multiply
   2,275.49x = 3,140.17 × 1,280.68
4. Step 4: Simplify right side
   2,275.49x = 4,021,541.86
5. Step 5: Solve for x
   x = 4,021,541.86/2,275.49
6. Step 6: Final answer
   x = 1,767.33