Finding the Fourth Proportional to 404,086.96, 557,435.16 and 308,427.58

Step by Step Solution

1. Step 1: Write the proportion equation
   404,086.96 : 557,435.16 = 308,427.58 : x
2. Step 2: Convert to fraction form
   404,086.96/557,435.16 = 308,427.58/x
3. Step 3: Cross multiply
   404,086.96x = 557,435.16 × 308,427.58
4. Step 4: Simplify right side
   404,086.96x = 171,928,377,405.71
5. Step 5: Solve for x
   x = 171,928,377,405.71/404,086.96
6. Step 6: Final answer
   x = 425,473.71