Finding the Third Proportional to 59,988 and 87,678

Step by Step Solution

1. Step 1: Write the proportion equation
   59,988 : 87,678 = 87,678 : x
2. Step 2: Convert to fraction form
   59,988/87,678 = 87,678/x
3. Step 3: Cross multiply
   59,988x = 87,678 × 87,678
4. Step 4: Simplify right side
   59,988x = 7,687,431,684
5. Step 5: Solve for x
   x = 7,687,431,684/59,988
6. Step 6: Final answer
   x = 128,149.49