Finding the Third Proportional to 315,499.50 and 684,231.75

Step by Step Solution

1. Step 1: Write the proportion equation
   315,499.50 : 684,231.75 = 684,231.75 : x
2. Step 2: Convert to fraction form
   315,499.50/684,231.75 = 684,231.75/x
3. Step 3: Cross multiply
   315,499.50x = 684,231.75 × 684,231.75
4. Step 4: Simplify right side
   315,499.50x = 468,173,087,708.06
5. Step 5: Solve for x
   x = 468,173,087,708.06/315,499.50
6. Step 6: Final answer
   x = 1,483,910.71