Finding the Fourth Proportional to 415,885.30, 622,661.55 and 404,221.30

Step by Step Solution

1. Step 1: Write the proportion equation
   415,885.30 : 622,661.55 = 404,221.30 : x
2. Step 2: Convert to fraction form
   415,885.30/622,661.55 = 404,221.30/x
3. Step 3: Cross multiply
   415,885.30x = 622,661.55 × 404,221.30
4. Step 4: Simplify right side
   415,885.30x = 251,693,061,201.02
5. Step 5: Solve for x
   x = 251,693,061,201.02/415,885.30
6. Step 6: Final answer
   x = 605,198.26