Finding the Third Proportional to 271,917 and 639,940.50

Step by Step Solution

1. Step 1: Write the proportion equation
   271,917 : 639,940.50 = 639,940.50 : x
2. Step 2: Convert to fraction form
   271,917/639,940.50 = 639,940.50/x
3. Step 3: Cross multiply
   271,917x = 639,940.50 × 639,940.50
4. Step 4: Simplify right side
   271,917x = 409,523,843,540.25
5. Step 5: Solve for x
   x = 409,523,843,540.25/271,917
6. Step 6: Final answer
   x = 1,506,061.94