Finding the Third Proportional to 319,983 and 679,318.50

Step by Step Solution

1. Step 1: Write the proportion equation
   319,983 : 679,318.50 = 679,318.50 : x
2. Step 2: Convert to fraction form
   319,983/679,318.50 = 679,318.50/x
3. Step 3: Cross multiply
   319,983x = 679,318.50 × 679,318.50
4. Step 4: Simplify right side
   319,983x = 461,473,624,442.25
5. Step 5: Solve for x
   x = 461,473,624,442.25/319,983
6. Step 6: Final answer
   x = 1,442,181.69