Finding the Fourth Proportional to 2,086.52, 2,879.40 and 1,155

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.52 : 2,879.40 = 1,155 : x
2. Step 2: Convert to fraction form
   2,086.52/2,879.40 = 1,155/x
3. Step 3: Cross multiply
   2,086.52x = 2,879.40 × 1,155
4. Step 4: Simplify right side
   2,086.52x = 3,325,707
5. Step 5: Solve for x
   x = 3,325,707/2,086.52
6. Step 6: Final answer
   x = 1,593.90