Finding the Third Proportional to 310,716 and 670,335.75

Step by Step Solution

1. Step 1: Write the proportion equation
   310,716 : 670,335.75 = 670,335.75 : x
2. Step 2: Convert to fraction form
   310,716/670,335.75 = 670,335.75/x
3. Step 3: Cross multiply
   310,716x = 670,335.75 × 670,335.75
4. Step 4: Simplify right side
   310,716x = 449,350,017,728.06
5. Step 5: Solve for x
   x = 449,350,017,728.06/310,716
6. Step 6: Final answer
   x = 1,446,175.99