Finding the Fourth Proportional to 2,256.18, 3,112.66 and 1,311.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,256.18 : 3,112.66 = 1,311.81 : x
2. Step 2: Convert to fraction form
   2,256.18/3,112.66 = 1,311.81/x
3. Step 3: Cross multiply
   2,256.18x = 3,112.66 × 1,311.81
4. Step 4: Simplify right side
   2,256.18x = 4,083,218.51
5. Step 5: Solve for x
   x = 4,083,218.51/2,256.18
6. Step 6: Final answer
   x = 1,809.79