Finding the Third Proportional to 30,990 and 63,628

Step by Step Solution

1. Step 1: Write the proportion equation
   30,990 : 63,628 = 63,628 : x
2. Step 2: Convert to fraction form
   30,990/63,628 = 63,628/x
3. Step 3: Cross multiply
   30,990x = 63,628 × 63,628
4. Step 4: Simplify right side
   30,990x = 4,048,522,384
5. Step 5: Solve for x
   x = 4,048,522,384/30,990
6. Step 6: Final answer
   x = 130,639.64