Finding the Fourth Proportional to 3,865.97, 5,786.12 and 3,520.10

Step by Step Solution

1. Step 1: Write the proportion equation
   3,865.97 : 5,786.12 = 3,520.10 : x
2. Step 2: Convert to fraction form
   3,865.97/5,786.12 = 3,520.10/x
3. Step 3: Cross multiply
   3,865.97x = 5,786.12 × 3,520.10
4. Step 4: Simplify right side
   3,865.97x = 20,367,691.93
5. Step 5: Solve for x
   x = 20,367,691.93/3,865.97
6. Step 6: Final answer
   x = 5,268.46