Finding the Fourth Proportional to 3,620.70, 5,443.20 and 3,086.10

Step by Step Solution

1. Step 1: Write the proportion equation
   3,620.70 : 5,443.20 = 3,086.10 : x
2. Step 2: Convert to fraction form
   3,620.70/5,443.20 = 3,086.10/x
3. Step 3: Cross multiply
   3,620.70x = 5,443.20 × 3,086.10
4. Step 4: Simplify right side
   3,620.70x = 16,798,259.52
5. Step 5: Solve for x
   x = 16,798,259.52/3,620.70
6. Step 6: Final answer
   x = 4,639.51