Finding the Fourth Proportional to 3,209.52, 4,424.71 and 3,139.66

Step by Step Solution

1. Step 1: Write the proportion equation
   3,209.52 : 4,424.71 = 3,139.66 : x
2. Step 2: Convert to fraction form
   3,209.52/4,424.71 = 3,139.66/x
3. Step 3: Cross multiply
   3,209.52x = 4,424.71 × 3,139.66
4. Step 4: Simplify right side
   3,209.52x = 13,892,047.18
5. Step 5: Solve for x
   x = 13,892,047.18/3,209.52
6. Step 6: Final answer
   x = 4,328.39