Finding the Fourth Proportional to 2,275.67, 3,140.40 and 1,280.96

Step by Step Solution

1. Step 1: Write the proportion equation
   2,275.67 : 3,140.40 = 1,280.96 : x
2. Step 2: Convert to fraction form
   2,275.67/3,140.40 = 1,280.96/x
3. Step 3: Cross multiply
   2,275.67x = 3,140.40 × 1,280.96
4. Step 4: Simplify right side
   2,275.67x = 4,022,726.78
5. Step 5: Solve for x
   x = 4,022,726.78/2,275.67
6. Step 6: Final answer
   x = 1,767.71