Finding the Third Proportional to 310,986 and 655,179.75

Step by Step Solution

1. Step 1: Write the proportion equation
   310,986 : 655,179.75 = 655,179.75 : x
2. Step 2: Convert to fraction form
   310,986/655,179.75 = 655,179.75/x
3. Step 3: Cross multiply
   310,986x = 655,179.75 × 655,179.75
4. Step 4: Simplify right side
   310,986x = 429,260,504,810.06
5. Step 5: Solve for x
   x = 429,260,504,810.06/310,986
6. Step 6: Final answer
   x = 1,380,320.99