Finding the Third Proportional to 315,554 and 679,222

Step by Step Solution

1. Step 1: Write the proportion equation
   315,554 : 679,222 = 679,222 : x
2. Step 2: Convert to fraction form
   315,554/679,222 = 679,222/x
3. Step 3: Cross multiply
   315,554x = 679,222 × 679,222
4. Step 4: Simplify right side
   315,554x = 461,342,525,284
5. Step 5: Solve for x
   x = 461,342,525,284/315,554
6. Step 6: Final answer
   x = 1,462,008.17