Finding the Third Proportional to 310,719.50 and 680,723

Step by Step Solution

1. Step 1: Write the proportion equation
   310,719.50 : 680,723 = 680,723 : x
2. Step 2: Convert to fraction form
   310,719.50/680,723 = 680,723/x
3. Step 3: Cross multiply
   310,719.50x = 680,723 × 680,723
4. Step 4: Simplify right side
   310,719.50x = 463,383,802,729
5. Step 5: Solve for x
   x = 463,383,802,729/310,719.50
6. Step 6: Final answer
   x = 1,491,325.14