Finding the Fourth Proportional to 20,979.83, 31,469.82 and 8,500.09

Step by Step Solution

1. Step 1: Write the proportion equation
   20,979.83 : 31,469.82 = 8,500.09 : x
2. Step 2: Convert to fraction form
   20,979.83/31,469.82 = 8,500.09/x
3. Step 3: Cross multiply
   20,979.83x = 31,469.82 × 8,500.09
4. Step 4: Simplify right side
   20,979.83x = 267,496,191.73
5. Step 5: Solve for x
   x = 267,496,191.73/20,979.83
6. Step 6: Final answer
   x = 12,750.16