Finding the Fourth Proportional to 20,139.37, 30,204.33 and 8,290.08

Step by Step Solution

1. Step 1: Write the proportion equation
   20,139.37 : 30,204.33 = 8,290.08 : x
2. Step 2: Convert to fraction form
   20,139.37/30,204.33 = 8,290.08/x
3. Step 3: Cross multiply
   20,139.37x = 30,204.33 × 8,290.08
4. Step 4: Simplify right side
   20,139.37x = 250,396,280.96
5. Step 5: Solve for x
   x = 250,396,280.96/20,139.37
6. Step 6: Final answer
   x = 12,433.18