Finding the Fourth Proportional to 2,086.72, 2,879.82 and 1,155.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.72 : 2,879.82 = 1,155.28 : x
2. Step 2: Convert to fraction form
   2,086.72/2,879.82 = 1,155.28/x
3. Step 3: Cross multiply
   2,086.72x = 2,879.82 × 1,155.28
4. Step 4: Simplify right side
   2,086.72x = 3,326,998.45
5. Step 5: Solve for x
   x = 3,326,998.45/2,086.72
6. Step 6: Final answer
   x = 1,594.37