Finding the Third Proportional to 30,909 and 67,488

Step by Step Solution

1. Step 1: Write the proportion equation
   30,909 : 67,488 = 67,488 : x
2. Step 2: Convert to fraction form
   30,909/67,488 = 67,488/x
3. Step 3: Cross multiply
   30,909x = 67,488 × 67,488
4. Step 4: Simplify right side
   30,909x = 4,554,630,144
5. Step 5: Solve for x
   x = 4,554,630,144/30,909
6. Step 6: Final answer
   x = 147,356.11