Finding the Fourth Proportional to 3,855.15, 5,752.44 and 3,620.05

Step by Step Solution

1. Step 1: Write the proportion equation
   3,855.15 : 5,752.44 = 3,620.05 : x
2. Step 2: Convert to fraction form
   3,855.15/5,752.44 = 3,620.05/x
3. Step 3: Cross multiply
   3,855.15x = 5,752.44 × 3,620.05
4. Step 4: Simplify right side
   3,855.15x = 20,824,106.04
5. Step 5: Solve for x
   x = 20,824,106.04/3,855.15
6. Step 6: Final answer
   x = 5,401.63