Finding the Third Proportional to 9,640 and 21,028

Step by Step Solution

1. Step 1: Write the proportion equation
   9,640 : 21,028 = 21,028 : x
2. Step 2: Convert to fraction form
   9,640/21,028 = 21,028/x
3. Step 3: Cross multiply
   9,640x = 21,028 × 21,028
4. Step 4: Simplify right side
   9,640x = 442,176,784
5. Step 5: Solve for x
   x = 442,176,784/9,640
6. Step 6: Final answer
   x = 45,868.96