Finding the Fourth Proportional to 404,979.31, 558,876.81 and 223,690.78

Step by Step Solution

1. Step 1: Write the proportion equation
   404,979.31 : 558,876.81 = 223,690.78 : x
2. Step 2: Convert to fraction form
   404,979.31/558,876.81 = 223,690.78/x
3. Step 3: Cross multiply
   404,979.31x = 558,876.81 × 223,690.78
4. Step 4: Simplify right side
   404,979.31x = 125,015,589,552.81
5. Step 5: Solve for x
   x = 125,015,589,552.81/404,979.31
6. Step 6: Final answer
   x = 308,696.24