Finding the Third Proportional to 271,852.50 and 639,616.50

Step by Step Solution

1. Step 1: Write the proportion equation
   271,852.50 : 639,616.50 = 639,616.50 : x
2. Step 2: Convert to fraction form
   271,852.50/639,616.50 = 639,616.50/x
3. Step 3: Cross multiply
   271,852.50x = 639,616.50 × 639,616.50
4. Step 4: Simplify right side
   271,852.50x = 409,109,267,072.25
5. Step 5: Solve for x
   x = 409,109,267,072.25/271,852.50
6. Step 6: Final answer
   x = 1,504,894.26