Finding the Fourth Proportional to 404,688.69, 558,430.56 and 223,388.91

Step by Step Solution

1. Step 1: Write the proportion equation
   404,688.69 : 558,430.56 = 223,388.91 : x
2. Step 2: Convert to fraction form
   404,688.69/558,430.56 = 223,388.91/x
3. Step 3: Cross multiply
   404,688.69x = 558,430.56 × 223,388.91
4. Step 4: Simplify right side
   404,688.69x = 124,747,194,109.09
5. Step 5: Solve for x
   x = 124,747,194,109.09/404,688.69
6. Step 6: Final answer
   x = 308,254.71