Finding the Third Proportional to 296,593.50 and 639,843

Step by Step Solution

1. Step 1: Write the proportion equation
   296,593.50 : 639,843 = 639,843 : x
2. Step 2: Convert to fraction form
   296,593.50/639,843 = 639,843/x
3. Step 3: Cross multiply
   296,593.50x = 639,843 × 639,843
4. Step 4: Simplify right side
   296,593.50x = 409,399,064,649
5. Step 5: Solve for x
   x = 409,399,064,649/296,593.50
6. Step 6: Final answer
   x = 1,380,337.28