Finding the Third Proportional to 315,940.50 and 685,082.81

Step by Step Solution

1. Step 1: Write the proportion equation
   315,940.50 : 685,082.81 = 685,082.81 : x
2. Step 2: Convert to fraction form
   315,940.50/685,082.81 = 685,082.81/x
3. Step 3: Cross multiply
   315,940.50x = 685,082.81 × 685,082.81
4. Step 4: Simplify right side
   315,940.50x = 469,338,459,982.91
5. Step 5: Solve for x
   x = 469,338,459,982.91/315,940.50
6. Step 6: Final answer
   x = 1,485,528.00