Finding the Third Proportional to 9,990 and 18,636

Step by Step Solution

1. Step 1: Write the proportion equation
   9,990 : 18,636 = 18,636 : x
2. Step 2: Convert to fraction form
   9,990/18,636 = 18,636/x
3. Step 3: Cross multiply
   9,990x = 18,636 × 18,636
4. Step 4: Simplify right side
   9,990x = 347,300,496
5. Step 5: Solve for x
   x = 347,300,496/9,990
6. Step 6: Final answer
   x = 34,764.81