Finding the Third Proportional to 12,138 and 21,732

Step by Step Solution

1. Step 1: Write the proportion equation
   12,138 : 21,732 = 21,732 : x
2. Step 2: Convert to fraction form
   12,138/21,732 = 21,732/x
3. Step 3: Cross multiply
   12,138x = 21,732 × 21,732
4. Step 4: Simplify right side
   12,138x = 472,279,824
5. Step 5: Solve for x
   x = 472,279,824/12,138
6. Step 6: Final answer
   x = 38,909.20