Finding the Fourth Proportional to 20,131.49, 30,171.15 and 8,271.83

Step by Step Solution

1. Step 1: Write the proportion equation
   20,131.49 : 30,171.15 = 8,271.83 : x
2. Step 2: Convert to fraction form
   20,131.49/30,171.15 = 8,271.83/x
3. Step 3: Cross multiply
   20,131.49x = 30,171.15 × 8,271.83
4. Step 4: Simplify right side
   20,131.49x = 249,570,472.85
5. Step 5: Solve for x
   x = 249,570,472.85/20,131.49
6. Step 6: Final answer
   x = 12,397.02