Finding the Fourth Proportional to 3,920.59, 5,406.61 and 2,647.27

Step by Step Solution

1. Step 1: Write the proportion equation
   3,920.59 : 5,406.61 = 2,647.27 : x
2. Step 2: Convert to fraction form
   3,920.59/5,406.61 = 2,647.27/x
3. Step 3: Cross multiply
   3,920.59x = 5,406.61 × 2,647.27
4. Step 4: Simplify right side
   3,920.59x = 14,312,756.45
5. Step 5: Solve for x
   x = 14,312,756.45/3,920.59
6. Step 6: Final answer
   x = 3,650.66