Finding the Third Proportional to 40,689 and 83,988

Step by Step Solution

1. Step 1: Write the proportion equation
   40,689 : 83,988 = 83,988 : x
2. Step 2: Convert to fraction form
   40,689/83,988 = 83,988/x
3. Step 3: Cross multiply
   40,689x = 83,988 × 83,988
4. Step 4: Simplify right side
   40,689x = 7,053,984,144
5. Step 5: Solve for x
   x = 7,053,984,144/40,689
6. Step 6: Final answer
   x = 173,363.42