Finding the Third Proportional to 20,644 and 30,990

Step by Step Solution

1. Step 1: Write the proportion equation
   20,644 : 30,990 = 30,990 : x
2. Step 2: Convert to fraction form
   20,644/30,990 = 30,990/x
3. Step 3: Cross multiply
   20,644x = 30,990 × 30,990
4. Step 4: Simplify right side
   20,644x = 960,380,100
5. Step 5: Solve for x
   x = 960,380,100/20,644
6. Step 6: Final answer
   x = 46,521.03