Finding the Third Proportional to 515,138 and 1,086,212

Step by Step Solution

1. Step 1: Write the proportion equation
   515,138 : 1,086,212 = 1,086,212 : x
2. Step 2: Convert to fraction form
   515,138/1,086,212 = 1,086,212/x
3. Step 3: Cross multiply
   515,138x = 1,086,212 × 1,086,212
4. Step 4: Simplify right side
   515,138x = 1,179,856,508,944
5. Step 5: Solve for x
   x = 1,179,856,508,944/515,138
6. Step 6: Final answer
   x = 2,290,369.78