Finding the Third Proportional to 319,977 and 679,306.50

Step by Step Solution

1. Step 1: Write the proportion equation
   319,977 : 679,306.50 = 679,306.50 : x
2. Step 2: Convert to fraction form
   319,977/679,306.50 = 679,306.50/x
3. Step 3: Cross multiply
   319,977x = 679,306.50 × 679,306.50
4. Step 4: Simplify right side
   319,977x = 461,457,320,942.25
5. Step 5: Solve for x
   x = 461,457,320,942.25/319,977
6. Step 6: Final answer
   x = 1,442,157.78