Finding the Third Proportional to 515,729.25 and 788,419.50

Step by Step Solution

1. Step 1: Write the proportion equation
   515,729.25 : 788,419.50 = 788,419.50 : x
2. Step 2: Convert to fraction form
   515,729.25/788,419.50 = 788,419.50/x
3. Step 3: Cross multiply
   515,729.25x = 788,419.50 × 788,419.50
4. Step 4: Simplify right side
   515,729.25x = 621,605,307,980.25
5. Step 5: Solve for x
   x = 621,605,307,980.25/515,729.25
6. Step 6: Final answer
   x = 1,205,293.88