Finding the Fourth Proportional to 263,736.77, 395,667.39 and 86,243.09

Step by Step Solution

1. Step 1: Write the proportion equation
   263,736.77 : 395,667.39 = 86,243.09 : x
2. Step 2: Convert to fraction form
   263,736.77/395,667.39 = 86,243.09/x
3. Step 3: Cross multiply
   263,736.77x = 395,667.39 × 86,243.09
4. Step 4: Simplify right side
   263,736.77x = 34,123,578,325.84
5. Step 5: Solve for x
   x = 34,123,578,325.84/263,736.77
6. Step 6: Final answer
   x = 129,384.99