Finding the Third Proportional to 30,920 and 67,620

Step by Step Solution

1. Step 1: Write the proportion equation
   30,920 : 67,620 = 67,620 : x
2. Step 2: Convert to fraction form
   30,920/67,620 = 67,620/x
3. Step 3: Cross multiply
   30,920x = 67,620 × 67,620
4. Step 4: Simplify right side
   30,920x = 4,572,464,400
5. Step 5: Solve for x
   x = 4,572,464,400/30,920
6. Step 6: Final answer
   x = 147,880.48