Finding the Fourth Proportional to 404,429.78, 604,275.56 and 390,286.12

Step by Step Solution

1. Step 1: Write the proportion equation
   404,429.78 : 604,275.56 = 390,286.12 : x
2. Step 2: Convert to fraction form
   404,429.78/604,275.56 = 390,286.12/x
3. Step 3: Cross multiply
   404,429.78x = 604,275.56 × 390,286.12
4. Step 4: Simplify right side
   404,429.78x = 235,840,363,723.23
5. Step 5: Solve for x
   x = 235,840,363,723.23/404,429.78
6. Step 6: Final answer
   x = 583,142.92