Finding the Third Proportional to 9,940 and 21,388

Step by Step Solution

1. Step 1: Write the proportion equation
   9,940 : 21,388 = 21,388 : x
2. Step 2: Convert to fraction form
   9,940/21,388 = 21,388/x
3. Step 3: Cross multiply
   9,940x = 21,388 × 21,388
4. Step 4: Simplify right side
   9,940x = 457,446,544
5. Step 5: Solve for x
   x = 457,446,544/9,940
6. Step 6: Final answer
   x = 46,020.78