Finding the Third Proportional to 310,455 and 679,027.50

Step by Step Solution

1. Step 1: Write the proportion equation
   310,455 : 679,027.50 = 679,027.50 : x
2. Step 2: Convert to fraction form
   310,455/679,027.50 = 679,027.50/x
3. Step 3: Cross multiply
   310,455x = 679,027.50 × 679,027.50
4. Step 4: Simplify right side
   310,455x = 461,078,345,756.25
5. Step 5: Solve for x
   x = 461,078,345,756.25/310,455
6. Step 6: Final answer
   x = 1,485,169.66