Finding the Fourth Proportional to 3,855.20, 5,320.22 and 2,086.83

Step by Step Solution

1. Step 1: Write the proportion equation
   3,855.20 : 5,320.22 = 2,086.83 : x
2. Step 2: Convert to fraction form
   3,855.20/5,320.22 = 2,086.83/x
3. Step 3: Cross multiply
   3,855.20x = 5,320.22 × 2,086.83
4. Step 4: Simplify right side
   3,855.20x = 11,102,384.27
5. Step 5: Solve for x
   x = 11,102,384.27/3,855.20
6. Step 6: Final answer
   x = 2,879.85