Finding the Third Proportional to 644,134 and 1,399,258

Step by Step Solution

1. Step 1: Write the proportion equation
   644,134 : 1,399,258 = 1,399,258 : x
2. Step 2: Convert to fraction form
   644,134/1,399,258 = 1,399,258/x
3. Step 3: Cross multiply
   644,134x = 1,399,258 × 1,399,258
4. Step 4: Simplify right side
   644,134x = 1,957,922,950,564
5. Step 5: Solve for x
   x = 1,957,922,950,564/644,134
6. Step 6: Final answer
   x = 3,039,620.56