Finding the Fourth Proportional to 311,429.57, 426,969.84 and 305,754.42

Step by Step Solution

1. Step 1: Write the proportion equation
   311,429.57 : 426,969.84 = 305,754.42 : x
2. Step 2: Convert to fraction form
   311,429.57/426,969.84 = 305,754.42/x
3. Step 3: Cross multiply
   311,429.57x = 426,969.84 × 305,754.42
4. Step 4: Simplify right side
   311,429.57x = 130,547,915,786.69
5. Step 5: Solve for x
   x = 130,547,915,786.69/311,429.57
6. Step 6: Final answer
   x = 419,189.21