Finding the Third Proportional to 30,820 and 63,100

Step by Step Solution

1. Step 1: Write the proportion equation
   30,820 : 63,100 = 63,100 : x
2. Step 2: Convert to fraction form
   30,820/63,100 = 63,100/x
3. Step 3: Cross multiply
   30,820x = 63,100 × 63,100
4. Step 4: Simplify right side
   30,820x = 3,981,610,000
5. Step 5: Solve for x
   x = 3,981,610,000/30,820
6. Step 6: Final answer
   x = 129,189.16