Finding the Third Proportional to 172,808 and 359,406

Step by Step Solution

1. Step 1: Write the proportion equation
   172,808 : 359,406 = 359,406 : x
2. Step 2: Convert to fraction form
   172,808/359,406 = 359,406/x
3. Step 3: Cross multiply
   172,808x = 359,406 × 359,406
4. Step 4: Simplify right side
   172,808x = 129,172,672,836
5. Step 5: Solve for x
   x = 129,172,672,836/172,808
6. Step 6: Final answer
   x = 747,492.44