Finding the Third Proportional to 8,402 and 12,359

Step by Step Solution

1. Step 1: Write the proportion equation
   8,402 : 12,359 = 12,359 : x
2. Step 2: Convert to fraction form
   8,402/12,359 = 12,359/x
3. Step 3: Cross multiply
   8,402x = 12,359 × 12,359
4. Step 4: Simplify right side
   8,402x = 152,744,881
5. Step 5: Solve for x
   x = 152,744,881/8,402
6. Step 6: Final answer
   x = 18,179.59