Finding the Third Proportional to 647,687 and 905,718

Step by Step Solution

1. Step 1: Write the proportion equation
   647,687 : 905,718 = 905,718 : x
2. Step 2: Convert to fraction form
   647,687/905,718 = 905,718/x
3. Step 3: Cross multiply
   647,687x = 905,718 × 905,718
4. Step 4: Simplify right side
   647,687x = 820,325,095,524
5. Step 5: Solve for x
   x = 820,325,095,524/647,687
6. Step 6: Final answer
   x = 1,266,545.56