Finding the Third Proportional to 301,807.69 and 639,598.78

Step by Step Solution

1. Step 1: Write the proportion equation
   301,807.69 : 639,598.78 = 639,598.78 : x
2. Step 2: Convert to fraction form
   301,807.69/639,598.78 = 639,598.78/x
3. Step 3: Cross multiply
   301,807.69x = 639,598.78 × 639,598.78
4. Step 4: Simplify right side
   301,807.69x = 409,086,600,976.49
5. Step 5: Solve for x
   x = 409,086,600,976.49/301,807.69
6. Step 6: Final answer
   x = 1,355,454.54