Finding the Third Proportional to 9,900 and 21,356

Step by Step Solution

1. Step 1: Write the proportion equation
   9,900 : 21,356 = 21,356 : x
2. Step 2: Convert to fraction form
   9,900/21,356 = 21,356/x
3. Step 3: Cross multiply
   9,900x = 21,356 × 21,356
4. Step 4: Simplify right side
   9,900x = 456,078,736
5. Step 5: Solve for x
   x = 456,078,736/9,900
6. Step 6: Final answer
   x = 46,068.56