Finding the Third Proportional to 301,834.50 and 639,648

Step by Step Solution

1. Step 1: Write the proportion equation
   301,834.50 : 639,648 = 639,648 : x
2. Step 2: Convert to fraction form
   301,834.50/639,648 = 639,648/x
3. Step 3: Cross multiply
   301,834.50x = 639,648 × 639,648
4. Step 4: Simplify right side
   301,834.50x = 409,149,563,904
5. Step 5: Solve for x
   x = 409,149,563,904/301,834.50
6. Step 6: Final answer
   x = 1,355,542.74