Finding the Fourth Proportional to 2,275.56, 3,140.24 and 1,280.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,275.56 : 3,140.24 = 1,280.79 : x
2. Step 2: Convert to fraction form
   2,275.56/3,140.24 = 1,280.79/x
3. Step 3: Cross multiply
   2,275.56x = 3,140.24 × 1,280.79
4. Step 4: Simplify right side
   2,275.56x = 4,021,981.59
5. Step 5: Solve for x
   x = 4,021,981.59/2,275.56
6. Step 6: Final answer
   x = 1,767.47