Finding the Third Proportional to 30,690 and 63,108

Step by Step Solution

1. Step 1: Write the proportion equation
   30,690 : 63,108 = 63,108 : x
2. Step 2: Convert to fraction form
   30,690/63,108 = 63,108/x
3. Step 3: Cross multiply
   30,690x = 63,108 × 63,108
4. Step 4: Simplify right side
   30,690x = 3,982,619,664
5. Step 5: Solve for x
   x = 3,982,619,664/30,690
6. Step 6: Final answer
   x = 129,769.30