Finding the Fourth Proportional to 2,255.10, 3,111.94 and 1,260.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,255.10 : 3,111.94 = 1,260.20 : x
2. Step 2: Convert to fraction form
   2,255.10/3,111.94 = 1,260.20/x
3. Step 3: Cross multiply
   2,255.10x = 3,111.94 × 1,260.20
4. Step 4: Simplify right side
   2,255.10x = 3,921,666.79
5. Step 5: Solve for x
   x = 3,921,666.79/2,255.10
6. Step 6: Final answer
   x = 1,739.02