Finding the Third Proportional to 8,042 and 12,790

Step by Step Solution

1. Step 1: Write the proportion equation
   8,042 : 12,790 = 12,790 : x
2. Step 2: Convert to fraction form
   8,042/12,790 = 12,790/x
3. Step 3: Cross multiply
   8,042x = 12,790 × 12,790
4. Step 4: Simplify right side
   8,042x = 163,584,100
5. Step 5: Solve for x
   x = 163,584,100/8,042
6. Step 6: Final answer
   x = 20,341.22