Finding the Fourth Proportional to 3,855.08, 5,320.04 and 2,086.72

Step by Step Solution

1. Step 1: Write the proportion equation
   3,855.08 : 5,320.04 = 2,086.72 : x
2. Step 2: Convert to fraction form
   3,855.08/5,320.04 = 2,086.72/x
3. Step 3: Cross multiply
   3,855.08x = 5,320.04 × 2,086.72
4. Step 4: Simplify right side
   3,855.08x = 11,101,433.87
5. Step 5: Solve for x
   x = 11,101,433.87/3,855.08
6. Step 6: Final answer
   x = 2,879.69