Finding the Third Proportional to 309,356 and 655,322

Step by Step Solution

1. Step 1: Write the proportion equation
   309,356 : 655,322 = 655,322 : x
2. Step 2: Convert to fraction form
   309,356/655,322 = 655,322/x
3. Step 3: Cross multiply
   309,356x = 655,322 × 655,322
4. Step 4: Simplify right side
   309,356x = 429,446,923,684
5. Step 5: Solve for x
   x = 429,446,923,684/309,356
6. Step 6: Final answer
   x = 1,388,196.52