Finding the Third Proportional to 10,449 and 21,168

Step by Step Solution

1. Step 1: Write the proportion equation
   10,449 : 21,168 = 21,168 : x
2. Step 2: Convert to fraction form
   10,449/21,168 = 21,168/x
3. Step 3: Cross multiply
   10,449x = 21,168 × 21,168
4. Step 4: Simplify right side
   10,449x = 448,084,224
5. Step 5: Solve for x
   x = 448,084,224/10,449
6. Step 6: Final answer
   x = 42,882.98