Finding the Third Proportional to 16,688 and 18,128

Step by Step Solution

1. Step 1: Write the proportion equation
   16,688 : 18,128 = 18,128 : x
2. Step 2: Convert to fraction form
   16,688/18,128 = 18,128/x
3. Step 3: Cross multiply
   16,688x = 18,128 × 18,128
4. Step 4: Simplify right side
   16,688x = 328,624,384
5. Step 5: Solve for x
   x = 328,624,384/16,688
6. Step 6: Final answer
   x = 19,692.26