Finding the Fourth Proportional to 2,275.02, 3,139.56 and 1,280.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,275.02 : 3,139.56 = 1,280.16 : x
2. Step 2: Convert to fraction form
   2,275.02/3,139.56 = 1,280.16/x
3. Step 3: Cross multiply
   2,275.02x = 3,139.56 × 1,280.16
4. Step 4: Simplify right side
   2,275.02x = 4,019,139.13
5. Step 5: Solve for x
   x = 4,019,139.13/2,275.02
6. Step 6: Final answer
   x = 1,766.64