Finding the Fourth Proportional to 4,296.27, 6,443.34 and 3,139.89

Step by Step Solution

1. Step 1: Write the proportion equation
   4,296.27 : 6,443.34 = 3,139.89 : x
2. Step 2: Convert to fraction form
   4,296.27/6,443.34 = 3,139.89/x
3. Step 3: Cross multiply
   4,296.27x = 6,443.34 × 3,139.89
4. Step 4: Simplify right side
   4,296.27x = 20,231,378.83
5. Step 5: Solve for x
   x = 20,231,378.83/4,296.27
6. Step 6: Final answer
   x = 4,709.06