Finding the Fourth Proportional to 404,392.10, 558,071.78 and 223,106.40

Step by Step Solution

1. Step 1: Write the proportion equation
   404,392.10 : 558,071.78 = 223,106.40 : x
2. Step 2: Convert to fraction form
   404,392.10/558,071.78 = 223,106.40/x
3. Step 3: Cross multiply
   404,392.10x = 558,071.78 × 223,106.40
4. Step 4: Simplify right side
   404,392.10x = 124,509,384,661.86
5. Step 5: Solve for x
   x = 124,509,384,661.86/404,392.10
6. Step 6: Final answer
   x = 307,892.73