Finding the Fourth Proportional to 404,978.40, 558,774.72 and 235,111.68

Step by Step Solution

1. Step 1: Write the proportion equation
   404,978.40 : 558,774.72 = 235,111.68 : x
2. Step 2: Convert to fraction form
   404,978.40/558,774.72 = 235,111.68/x
3. Step 3: Cross multiply
   404,978.40x = 558,774.72 × 235,111.68
4. Step 4: Simplify right side
   404,978.40x = 131,374,463,160.73
5. Step 5: Solve for x
   x = 131,374,463,160.73/404,978.40
6. Step 6: Final answer
   x = 324,398.69