Finding the Third Proportional to 639,942 and 1,374,856

Step by Step Solution

1. Step 1: Write the proportion equation
   639,942 : 1,374,856 = 1,374,856 : x
2. Step 2: Convert to fraction form
   639,942/1,374,856 = 1,374,856/x
3. Step 3: Cross multiply
   639,942x = 1,374,856 × 1,374,856
4. Step 4: Simplify right side
   639,942x = 1,890,229,020,736
5. Step 5: Solve for x
   x = 1,890,229,020,736/639,942
6. Step 6: Final answer
   x = 2,953,750.53