Finding the Third Proportional to 515,786 and 788,499

Step by Step Solution

1. Step 1: Write the proportion equation
   515,786 : 788,499 = 788,499 : x
2. Step 2: Convert to fraction form
   515,786/788,499 = 788,499/x
3. Step 3: Cross multiply
   515,786x = 788,499 × 788,499
4. Step 4: Simplify right side
   515,786x = 621,730,673,001
5. Step 5: Solve for x
   x = 621,730,673,001/515,786
6. Step 6: Final answer
   x = 1,205,404.32