Finding the Fourth Proportional to 410,739.69, 616,341.50 and 221,196.05

Step by Step Solution

1. Step 1: Write the proportion equation
   410,739.69 : 616,341.50 = 221,196.05 : x
2. Step 2: Convert to fraction form
   410,739.69/616,341.50 = 221,196.05/x
3. Step 3: Cross multiply
   410,739.69x = 616,341.50 × 221,196.05
4. Step 4: Simplify right side
   410,739.69x = 136,332,305,448.38
5. Step 5: Solve for x
   x = 136,332,305,448.38/410,739.69
6. Step 6: Final answer
   x = 331,918.99