Finding the Third Proportional to 10,005 and 21,243

Step by Step Solution

1. Step 1: Write the proportion equation
   10,005 : 21,243 = 21,243 : x
2. Step 2: Convert to fraction form
   10,005/21,243 = 21,243/x
3. Step 3: Cross multiply
   10,005x = 21,243 × 21,243
4. Step 4: Simplify right side
   10,005x = 451,265,049
5. Step 5: Solve for x
   x = 451,265,049/10,005
6. Step 6: Final answer
   x = 45,103.95