Finding the Third Proportional to 30,578 and 67,170

Step by Step Solution

1. Step 1: Write the proportion equation
   30,578 : 67,170 = 67,170 : x
2. Step 2: Convert to fraction form
   30,578/67,170 = 67,170/x
3. Step 3: Cross multiply
   30,578x = 67,170 × 67,170
4. Step 4: Simplify right side
   30,578x = 4,511,808,900
5. Step 5: Solve for x
   x = 4,511,808,900/30,578
6. Step 6: Final answer
   x = 147,550.82