Finding the Third Proportional to 313,839 and 686,362.50

Step by Step Solution

1. Step 1: Write the proportion equation
   313,839 : 686,362.50 = 686,362.50 : x
2. Step 2: Convert to fraction form
   313,839/686,362.50 = 686,362.50/x
3. Step 3: Cross multiply
   313,839x = 686,362.50 × 686,362.50
4. Step 4: Simplify right side
   313,839x = 471,093,481,406.25
5. Step 5: Solve for x
   x = 471,093,481,406.25/313,839
6. Step 6: Final answer
   x = 1,501,067.37