Finding the Fourth Proportional to 2,255.31, 3,111.48 and 1,370.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,255.31 : 3,111.48 = 1,370.79 : x
2. Step 2: Convert to fraction form
   2,255.31/3,111.48 = 1,370.79/x
3. Step 3: Cross multiply
   2,255.31x = 3,111.48 × 1,370.79
4. Step 4: Simplify right side
   2,255.31x = 4,265,185.67
5. Step 5: Solve for x
   x = 4,265,185.67/2,255.31
6. Step 6: Final answer
   x = 1,891.17