Finding the Fourth Proportional to 2,255.28, 3,111.99 and 1,260.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,255.28 : 3,111.99 = 1,260.60 : x
2. Step 2: Convert to fraction form
   2,255.28/3,111.99 = 1,260.60/x
3. Step 3: Cross multiply
   2,255.28x = 3,111.99 × 1,260.60
4. Step 4: Simplify right side
   2,255.28x = 3,922,958.20
5. Step 5: Solve for x
   x = 3,922,958.20/2,255.28
6. Step 6: Final answer
   x = 1,739.46