Finding the Fourth Proportional to 269,078.36, 403,419.89 and 128,935.40

Step by Step Solution

1. Step 1: Write the proportion equation
   269,078.36 : 403,419.89 = 128,935.40 : x
2. Step 2: Convert to fraction form
   269,078.36/403,419.89 = 128,935.40/x
3. Step 3: Cross multiply
   269,078.36x = 403,419.89 × 128,935.40
4. Step 4: Simplify right side
   269,078.36x = 52,015,103,190.35
5. Step 5: Solve for x
   x = 52,015,103,190.35/269,078.36
6. Step 6: Final answer
   x = 193,308.39