Finding the Third Proportional to 639,258 and 1,365,996

Step by Step Solution

1. Step 1: Write the proportion equation
   639,258 : 1,365,996 = 1,365,996 : x
2. Step 2: Convert to fraction form
   639,258/1,365,996 = 1,365,996/x
3. Step 3: Cross multiply
   639,258x = 1,365,996 × 1,365,996
4. Step 4: Simplify right side
   639,258x = 1,865,945,072,016
5. Step 5: Solve for x
   x = 1,865,945,072,016/639,258
6. Step 6: Final answer
   x = 2,918,923.30