Finding the Third Proportional to 30,720 and 63,600

Step by Step Solution

1. Step 1: Write the proportion equation
   30,720 : 63,600 = 63,600 : x
2. Step 2: Convert to fraction form
   30,720/63,600 = 63,600/x
3. Step 3: Cross multiply
   30,720x = 63,600 × 63,600
4. Step 4: Simplify right side
   30,720x = 4,044,960,000
5. Step 5: Solve for x
   x = 4,044,960,000/30,720
6. Step 6: Final answer
   x = 131,671.88