Finding the Third Proportional to 310,716.75 and 680,718

Step by Step Solution

1. Step 1: Write the proportion equation
   310,716.75 : 680,718 = 680,718 : x
2. Step 2: Convert to fraction form
   310,716.75/680,718 = 680,718/x
3. Step 3: Cross multiply
   310,716.75x = 680,718 × 680,718
4. Step 4: Simplify right side
   310,716.75x = 463,376,995,524
5. Step 5: Solve for x
   x = 463,376,995,524/310,716.75
6. Step 6: Final answer
   x = 1,491,316.43