Finding the Fourth Proportional to 2,255.38, 3,112.33 and 1,311.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,255.38 : 3,112.33 = 1,311.12 : x
2. Step 2: Convert to fraction form
   2,255.38/3,112.33 = 1,311.12/x
3. Step 3: Cross multiply
   2,255.38x = 3,112.33 × 1,311.12
4. Step 4: Simplify right side
   2,255.38x = 4,080,648.58
5. Step 5: Solve for x
   x = 4,080,648.58/2,255.38
6. Step 6: Final answer
   x = 1,809.30