Finding the Fourth Proportional to 3,920.27, 5,406.80 and 3,447.17

Step by Step Solution

1. Step 1: Write the proportion equation
   3,920.27 : 5,406.80 = 3,447.17 : x
2. Step 2: Convert to fraction form
   3,920.27/5,406.80 = 3,447.17/x
3. Step 3: Cross multiply
   3,920.27x = 5,406.80 × 3,447.17
4. Step 4: Simplify right side
   3,920.27x = 18,638,155.04
5. Step 5: Solve for x
   x = 18,638,155.04/3,920.27
6. Step 6: Final answer
   x = 4,754.31