Finding the Third Proportional to 9,906 and 21,521

Step by Step Solution

1. Step 1: Write the proportion equation
   9,906 : 21,521 = 21,521 : x
2. Step 2: Convert to fraction form
   9,906/21,521 = 21,521/x
3. Step 3: Cross multiply
   9,906x = 21,521 × 21,521
4. Step 4: Simplify right side
   9,906x = 463,153,441
5. Step 5: Solve for x
   x = 463,153,441/9,906
6. Step 6: Final answer
   x = 46,754.84