Finding the Third Proportional to 21,024 and 42,642

Step by Step Solution

1. Step 1: Write the proportion equation
   21,024 : 42,642 = 42,642 : x
2. Step 2: Convert to fraction form
   21,024/42,642 = 42,642/x
3. Step 3: Cross multiply
   21,024x = 42,642 × 42,642
4. Step 4: Simplify right side
   21,024x = 1,818,340,164
5. Step 5: Solve for x
   x = 1,818,340,164/21,024
6. Step 6: Final answer
   x = 86,488.78