Finding the Third Proportional to 12,858 and 17,172

Step by Step Solution

1. Step 1: Write the proportion equation
   12,858 : 17,172 = 17,172 : x
2. Step 2: Convert to fraction form
   12,858/17,172 = 17,172/x
3. Step 3: Cross multiply
   12,858x = 17,172 × 17,172
4. Step 4: Simplify right side
   12,858x = 294,877,584
5. Step 5: Solve for x
   x = 294,877,584/12,858
6. Step 6: Final answer
   x = 22,933.39