Finding the Fourth Proportional to 2,086.71, 2,879.63 and 1,155.21

Step by Step Solution

1. Step 1: Write the proportion equation
   2,086.71 : 2,879.63 = 1,155.21 : x
2. Step 2: Convert to fraction form
   2,086.71/2,879.63 = 1,155.21/x
3. Step 3: Cross multiply
   2,086.71x = 2,879.63 × 1,155.21
4. Step 4: Simplify right side
   2,086.71x = 3,326,571.60
5. Step 5: Solve for x
   x = 3,326,571.60/2,086.71
6. Step 6: Final answer
   x = 1,594.17