Finding the Third Proportional to 515,188 and 788,123

Step by Step Solution

1. Step 1: Write the proportion equation
   515,188 : 788,123 = 788,123 : x
2. Step 2: Convert to fraction form
   515,188/788,123 = 788,123/x
3. Step 3: Cross multiply
   515,188x = 788,123 × 788,123
4. Step 4: Simplify right side
   515,188x = 621,137,863,129
5. Step 5: Solve for x
   x = 621,137,863,129/515,188
6. Step 6: Final answer
   x = 1,205,652.82