Finding the Third Proportional to 515,817 and 788,989.50

Step by Step Solution

1. Step 1: Write the proportion equation
   515,817 : 788,989.50 = 788,989.50 : x
2. Step 2: Convert to fraction form
   515,817/788,989.50 = 788,989.50/x
3. Step 3: Cross multiply
   515,817x = 788,989.50 × 788,989.50
4. Step 4: Simplify right side
   515,817x = 622,504,431,110.25
5. Step 5: Solve for x
   x = 622,504,431,110.25/515,817
6. Step 6: Final answer
   x = 1,206,831.94