Finding the Third Proportional to 309,100 and 677,222

Step by Step Solution

1. Step 1: Write the proportion equation
   309,100 : 677,222 = 677,222 : x
2. Step 2: Convert to fraction form
   309,100/677,222 = 677,222/x
3. Step 3: Cross multiply
   309,100x = 677,222 × 677,222
4. Step 4: Simplify right side
   309,100x = 458,629,637,284
5. Step 5: Solve for x
   x = 458,629,637,284/309,100
6. Step 6: Final answer
   x = 1,483,758.13