Finding the Third Proportional to 171,396 and 351,144

Step by Step Solution

1. Step 1: Write the proportion equation
   171,396 : 351,144 = 351,144 : x
2. Step 2: Convert to fraction form
   171,396/351,144 = 351,144/x
3. Step 3: Cross multiply
   171,396x = 351,144 × 351,144
4. Step 4: Simplify right side
   171,396x = 123,302,108,736
5. Step 5: Solve for x
   x = 123,302,108,736/171,396
6. Step 6: Final answer
   x = 719,398.99