Finding the Third Proportional to 21,288 and 43,636

Step by Step Solution

1. Step 1: Write the proportion equation
   21,288 : 43,636 = 43,636 : x
2. Step 2: Convert to fraction form
   21,288/43,636 = 43,636/x
3. Step 3: Cross multiply
   21,288x = 43,636 × 43,636
4. Step 4: Simplify right side
   21,288x = 1,904,100,496
5. Step 5: Solve for x
   x = 1,904,100,496/21,288
6. Step 6: Final answer
   x = 89,444.78