Finding the Fourth Proportional to 404,662.81, 558,447.89 and 220,911.17

Step by Step Solution

1. Step 1: Write the proportion equation
   404,662.81 : 558,447.89 = 220,911.17 : x
2. Step 2: Convert to fraction form
   404,662.81/558,447.89 = 220,911.17/x
3. Step 3: Cross multiply
   404,662.81x = 558,447.89 × 220,911.17
4. Step 4: Simplify right side
   404,662.81x = 123,367,379,134.25
5. Step 5: Solve for x
   x = 123,367,379,134.25/404,662.81
6. Step 6: Final answer
   x = 304,864.64