Finding the Third Proportional to 315,443 and 684,125.75

Step by Step Solution

1. Step 1: Write the proportion equation
   315,443 : 684,125.75 = 684,125.75 : x
2. Step 2: Convert to fraction form
   315,443/684,125.75 = 684,125.75/x
3. Step 3: Cross multiply
   315,443x = 684,125.75 × 684,125.75
4. Step 4: Simplify right side
   315,443x = 468,028,041,813.06
5. Step 5: Solve for x
   x = 468,028,041,813.06/315,443
6. Step 6: Final answer
   x = 1,483,716.68