Finding the Third Proportional to 20,387 and 42,988

Step by Step Solution

1. Step 1: Write the proportion equation
   20,387 : 42,988 = 42,988 : x
2. Step 2: Convert to fraction form
   20,387/42,988 = 42,988/x
3. Step 3: Cross multiply
   20,387x = 42,988 × 42,988
4. Step 4: Simplify right side
   20,387x = 1,847,968,144
5. Step 5: Solve for x
   x = 1,847,968,144/20,387
6. Step 6: Final answer
   x = 90,644.44