Finding the Third Proportional to 301,806 and 639,589.50

Step by Step Solution

1. Step 1: Write the proportion equation
   301,806 : 639,589.50 = 639,589.50 : x
2. Step 2: Convert to fraction form
   301,806/639,589.50 = 639,589.50/x
3. Step 3: Cross multiply
   301,806x = 639,589.50 × 639,589.50
4. Step 4: Simplify right side
   301,806x = 409,074,728,510.25
5. Step 5: Solve for x
   x = 409,074,728,510.25/301,806
6. Step 6: Final answer
   x = 1,355,422.78