Finding the Third Proportional to 309,096 and 670,680

Step by Step Solution

1. Step 1: Write the proportion equation
   309,096 : 670,680 = 670,680 : x
2. Step 2: Convert to fraction form
   309,096/670,680 = 670,680/x
3. Step 3: Cross multiply
   309,096x = 670,680 × 670,680
4. Step 4: Simplify right side
   309,096x = 449,811,662,400
5. Step 5: Solve for x
   x = 449,811,662,400/309,096
6. Step 6: Final answer
   x = 1,455,249.06