Finding the Third Proportional to 301,903.50 and 639,771

Step by Step Solution

1. Step 1: Write the proportion equation
   301,903.50 : 639,771 = 639,771 : x
2. Step 2: Convert to fraction form
   301,903.50/639,771 = 639,771/x
3. Step 3: Cross multiply
   301,903.50x = 639,771 × 639,771
4. Step 4: Simplify right side
   301,903.50x = 409,306,932,441
5. Step 5: Solve for x
   x = 409,306,932,441/301,903.50
6. Step 6: Final answer
   x = 1,355,754.18