Finding the Third Proportional to 30,920 and 43,680

Step by Step Solution

1. Step 1: Write the proportion equation
   30,920 : 43,680 = 43,680 : x
2. Step 2: Convert to fraction form
   30,920/43,680 = 43,680/x
3. Step 3: Cross multiply
   30,920x = 43,680 × 43,680
4. Step 4: Simplify right side
   30,920x = 1,907,942,400
5. Step 5: Solve for x
   x = 1,907,942,400/30,920
6. Step 6: Final answer
   x = 61,705.77