Finding the Fourth Proportional to 404,708.21, 558,498.15 and 223,420.38

Step by Step Solution

1. Step 1: Write the proportion equation
   404,708.21 : 558,498.15 = 223,420.38 : x
2. Step 2: Convert to fraction form
   404,708.21/558,498.15 = 223,420.38/x
3. Step 3: Cross multiply
   404,708.21x = 558,498.15 × 223,420.38
4. Step 4: Simplify right side
   404,708.21x = 124,779,870,996.67
5. Step 5: Solve for x
   x = 124,779,870,996.67/404,708.21
6. Step 6: Final answer
   x = 308,320.59