Finding the Third Proportional to 16,389 and 17,865

Step by Step Solution

1. Step 1: Write the proportion equation
   16,389 : 17,865 = 17,865 : x
2. Step 2: Convert to fraction form
   16,389/17,865 = 17,865/x
3. Step 3: Cross multiply
   16,389x = 17,865 × 17,865
4. Step 4: Simplify right side
   16,389x = 319,158,225
5. Step 5: Solve for x
   x = 319,158,225/16,389
6. Step 6: Final answer
   x = 19,473.93