Finding the Third Proportional to 2,678 and 3,988

Step by Step Solution

1. Step 1: Write the proportion equation
   2,678 : 3,988 = 3,988 : x
2. Step 2: Convert to fraction form
   2,678/3,988 = 3,988/x
3. Step 3: Cross multiply
   2,678x = 3,988 × 3,988
4. Step 4: Simplify right side
   2,678x = 15,904,144
5. Step 5: Solve for x
   x = 15,904,144/2,678
6. Step 6: Final answer
   x = 5,938.81