Finding the Third Proportional to 17,628 and 18,128

Step by Step Solution

1. Step 1: Write the proportion equation
   17,628 : 18,128 = 18,128 : x
2. Step 2: Convert to fraction form
   17,628/18,128 = 18,128/x
3. Step 3: Cross multiply
   17,628x = 18,128 × 18,128
4. Step 4: Simplify right side
   17,628x = 328,624,384
5. Step 5: Solve for x
   x = 328,624,384/17,628
6. Step 6: Final answer
   x = 18,642.18