Finding the Fourth Proportional to 2,255.22, 3,112.23 and 1,311.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,255.22 : 3,112.23 = 1,311.09 : x
2. Step 2: Convert to fraction form
   2,255.22/3,112.23 = 1,311.09/x
3. Step 3: Cross multiply
   2,255.22x = 3,112.23 × 1,311.09
4. Step 4: Simplify right side
   2,255.22x = 4,080,413.63
5. Step 5: Solve for x
   x = 4,080,413.63/2,255.22
6. Step 6: Final answer
   x = 1,809.32