Finding the Third Proportional to 647,910 and 729,103.50

Step by Step Solution

1. Step 1: Write the proportion equation
   647,910 : 729,103.50 = 729,103.50 : x
2. Step 2: Convert to fraction form
   647,910/729,103.50 = 729,103.50/x
3. Step 3: Cross multiply
   647,910x = 729,103.50 × 729,103.50
4. Step 4: Simplify right side
   647,910x = 531,591,913,712.25
5. Step 5: Solve for x
   x = 531,591,913,712.25/647,910
6. Step 6: Final answer
   x = 820,471.85