Finding the Third Proportional to 12,808 and 16,172

Step by Step Solution

1. Step 1: Write the proportion equation
   12,808 : 16,172 = 16,172 : x
2. Step 2: Convert to fraction form
   12,808/16,172 = 16,172/x
3. Step 3: Cross multiply
   12,808x = 16,172 × 16,172
4. Step 4: Simplify right side
   12,808x = 261,533,584
5. Step 5: Solve for x
   x = 261,533,584/12,808
6. Step 6: Final answer
   x = 20,419.55