Finding the Third Proportional to 143,714 and 315,679

Step by Step Solution

1. Step 1: Write the proportion equation
   143,714 : 315,679 = 315,679 : x
2. Step 2: Convert to fraction form
   143,714/315,679 = 315,679/x
3. Step 3: Cross multiply
   143,714x = 315,679 × 315,679
4. Step 4: Simplify right side
   143,714x = 99,653,231,041
5. Step 5: Solve for x
   x = 99,653,231,041/143,714
6. Step 6: Final answer
   x = 693,413.52