Finding the Fourth Proportional to 8,982.39, 13,479.97 and 3,139.05

Step by Step Solution

1. Step 1: Write the proportion equation
   8,982.39 : 13,479.97 = 3,139.05 : x
2. Step 2: Convert to fraction form
   8,982.39/13,479.97 = 3,139.05/x
3. Step 3: Cross multiply
   8,982.39x = 13,479.97 × 3,139.05
4. Step 4: Simplify right side
   8,982.39x = 42,314,348.42
5. Step 5: Solve for x
   x = 42,314,348.42/8,982.39
6. Step 6: Final answer
   x = 4,710.81