Finding the Third Proportional to 639,015 and 1,377,675.50

Step by Step Solution

1. Step 1: Write the proportion equation
   639,015 : 1,377,675.50 = 1,377,675.50 : x
2. Step 2: Convert to fraction form
   639,015/1,377,675.50 = 1,377,675.50/x
3. Step 3: Cross multiply
   639,015x = 1,377,675.50 × 1,377,675.50
4. Step 4: Simplify right side
   639,015x = 1,897,989,783,300.25
5. Step 5: Solve for x
   x = 1,897,989,783,300.25/639,015
6. Step 6: Final answer
   x = 2,970,180.33