Finding the Fourth Proportional to 641,713.89, 885,571.73 and 355,227.83

Step by Step Solution

1. Step 1: Write the proportion equation
   641,713.89 : 885,571.73 = 355,227.83 : x
2. Step 2: Convert to fraction form
   641,713.89/885,571.73 = 355,227.83/x
3. Step 3: Cross multiply
   641,713.89x = 885,571.73 × 355,227.83
4. Step 4: Simplify right side
   641,713.89x = 314,579,724,404.40
5. Step 5: Solve for x
   x = 314,579,724,404.40/641,713.89
6. Step 6: Final answer
   x = 490,218.04