Finding the Fourth Proportional to 576,105.69, 864,200.05 and 221,119.71

Step by Step Solution

1. Step 1: Write the proportion equation
   576,105.69 : 864,200.05 = 221,119.71 : x
2. Step 2: Convert to fraction form
   576,105.69/864,200.05 = 221,119.71/x
3. Step 3: Cross multiply
   576,105.69x = 864,200.05 × 221,119.71
4. Step 4: Simplify right side
   576,105.69x = 191,091,659,011.39
5. Step 5: Solve for x
   x = 191,091,659,011.39/576,105.69
6. Step 6: Final answer
   x = 331,695.49