Finding the Third Proportional to 318,048 and 685,918.50

Step by Step Solution

1. Step 1: Write the proportion equation
   318,048 : 685,918.50 = 685,918.50 : x
2. Step 2: Convert to fraction form
   318,048/685,918.50 = 685,918.50/x
3. Step 3: Cross multiply
   318,048x = 685,918.50 × 685,918.50
4. Step 4: Simplify right side
   318,048x = 470,484,188,642.25
5. Step 5: Solve for x
   x = 470,484,188,642.25/318,048
6. Step 6: Final answer
   x = 1,479,286.74