Finding the Third Proportional to 10,009 and 21,249

Step by Step Solution

1. Step 1: Write the proportion equation
   10,009 : 21,249 = 21,249 : x
2. Step 2: Convert to fraction form
   10,009/21,249 = 21,249/x
3. Step 3: Cross multiply
   10,009x = 21,249 × 21,249
4. Step 4: Simplify right side
   10,009x = 451,520,001
5. Step 5: Solve for x
   x = 451,520,001/10,009
6. Step 6: Final answer
   x = 45,111.40