Finding the Fourth Proportional to 405,728.78, 608,648.55 and 169,016.09

Step by Step Solution

1. Step 1: Write the proportion equation
   405,728.78 : 608,648.55 = 169,016.09 : x
2. Step 2: Convert to fraction form
   405,728.78/608,648.55 = 169,016.09/x
3. Step 3: Cross multiply
   405,728.78x = 608,648.55 × 169,016.09
4. Step 4: Simplify right side
   405,728.78x = 102,871,398,105.17
5. Step 5: Solve for x
   x = 102,871,398,105.17/405,728.78
6. Step 6: Final answer
   x = 253,547.20