Finding the Third Proportional to 12,420 and 21,834

Step by Step Solution

1. Step 1: Write the proportion equation
   12,420 : 21,834 = 21,834 : x
2. Step 2: Convert to fraction form
   12,420/21,834 = 21,834/x
3. Step 3: Cross multiply
   12,420x = 21,834 × 21,834
4. Step 4: Simplify right side
   12,420x = 476,723,556
5. Step 5: Solve for x
   x = 476,723,556/12,420
6. Step 6: Final answer
   x = 38,383.54