Finding the Third Proportional to 687,906 and 1,042,245

Step by Step Solution

1. Step 1: Write the proportion equation
   687,906 : 1,042,245 = 1,042,245 : x
2. Step 2: Convert to fraction form
   687,906/1,042,245 = 1,042,245/x
3. Step 3: Cross multiply
   687,906x = 1,042,245 × 1,042,245
4. Step 4: Simplify right side
   687,906x = 1,086,274,640,025
5. Step 5: Solve for x
   x = 1,086,274,640,025/687,906
6. Step 6: Final answer
   x = 1,579,103.31