Finding the Fourth Proportional to 2,255.39, 3,112.62 and 1,311.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,255.39 : 3,112.62 = 1,311.48 : x
2. Step 2: Convert to fraction form
   2,255.39/3,112.62 = 1,311.48/x
3. Step 3: Cross multiply
   2,255.39x = 3,112.62 × 1,311.48
4. Step 4: Simplify right side
   2,255.39x = 4,082,138.88
5. Step 5: Solve for x
   x = 4,082,138.88/2,255.39
6. Step 6: Final answer
   x = 1,809.95