Finding the Fourth Proportional to 2,086.75, 2,879.72 and 1,155.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.75 : 2,879.72 = 1,155.31 : x
2. Step 2: Convert to fraction form
   2,086.75/2,879.72 = 1,155.31/x
3. Step 3: Cross multiply
   2,086.75x = 2,879.72 × 1,155.31
4. Step 4: Simplify right side
   2,086.75x = 3,326,969.31
5. Step 5: Solve for x
   x = 3,326,969.31/2,086.75
6. Step 6: Final answer
   x = 1,594.33