Finding the Third Proportional to 9,660 and 21,172

Step by Step Solution

1. Step 1: Write the proportion equation
   9,660 : 21,172 = 21,172 : x
2. Step 2: Convert to fraction form
   9,660/21,172 = 21,172/x
3. Step 3: Cross multiply
   9,660x = 21,172 × 21,172
4. Step 4: Simplify right side
   9,660x = 448,253,584
5. Step 5: Solve for x
   x = 448,253,584/9,660
6. Step 6: Final answer
   x = 46,403.06