Finding the Third Proportional to 12,779 and 19,836

Step by Step Solution

1. Step 1: Write the proportion equation
   12,779 : 19,836 = 19,836 : x
2. Step 2: Convert to fraction form
   12,779/19,836 = 19,836/x
3. Step 3: Cross multiply
   12,779x = 19,836 × 19,836
4. Step 4: Simplify right side
   12,779x = 393,466,896
5. Step 5: Solve for x
   x = 393,466,896/12,779
6. Step 6: Final answer
   x = 30,790.12