Finding the Third Proportional to 30,915 and 67,311

Step by Step Solution

1. Step 1: Write the proportion equation
   30,915 : 67,311 = 67,311 : x
2. Step 2: Convert to fraction form
   30,915/67,311 = 67,311/x
3. Step 3: Cross multiply
   30,915x = 67,311 × 67,311
4. Step 4: Simplify right side
   30,915x = 4,530,770,721
5. Step 5: Solve for x
   x = 4,530,770,721/30,915
6. Step 6: Final answer
   x = 146,555.74