Finding the Fourth Proportional to 2,275.24, 3,139.84 and 1,280.56

Step by Step Solution

1. Step 1: Write the proportion equation
   2,275.24 : 3,139.84 = 1,280.56 : x
2. Step 2: Convert to fraction form
   2,275.24/3,139.84 = 1,280.56/x
3. Step 3: Cross multiply
   2,275.24x = 3,139.84 × 1,280.56
4. Step 4: Simplify right side
   2,275.24x = 4,020,753.51
5. Step 5: Solve for x
   x = 4,020,753.51/2,275.24
6. Step 6: Final answer
   x = 1,767.18