Finding the Third Proportional to 310,715.25 and 680,715

Step by Step Solution

1. Step 1: Write the proportion equation
   310,715.25 : 680,715 = 680,715 : x
2. Step 2: Convert to fraction form
   310,715.25/680,715 = 680,715/x
3. Step 3: Cross multiply
   310,715.25x = 680,715 × 680,715
4. Step 4: Simplify right side
   310,715.25x = 463,372,911,225
5. Step 5: Solve for x
   x = 463,372,911,225/310,715.25
6. Step 6: Final answer
   x = 1,491,310.49