Finding the Third Proportional to 16,420 and 17,956

Step by Step Solution

1. Step 1: Write the proportion equation
   16,420 : 17,956 = 17,956 : x
2. Step 2: Convert to fraction form
   16,420/17,956 = 17,956/x
3. Step 3: Cross multiply
   16,420x = 17,956 × 17,956
4. Step 4: Simplify right side
   16,420x = 322,417,936
5. Step 5: Solve for x
   x = 322,417,936/16,420
6. Step 6: Final answer
   x = 19,635.68