Finding the Fourth Proportional to 2,275.35, 3,140.28 and 1,280.82

Step by Step Solution

1. Step 1: Write the proportion equation
   2,275.35 : 3,140.28 = 1,280.82 : x
2. Step 2: Convert to fraction form
   2,275.35/3,140.28 = 1,280.82/x
3. Step 3: Cross multiply
   2,275.35x = 3,140.28 × 1,280.82
4. Step 4: Simplify right side
   2,275.35x = 4,022,127.54
5. Step 5: Solve for x
   x = 4,022,127.54/2,275.35
6. Step 6: Final answer
   x = 1,767.70