Finding the Fourth Proportional to 443.31, 611.69 and 256.82

Step by Step Solution

1. Step 1: Write the proportion equation
   443.31 : 611.69 = 256.82 : x
2. Step 2: Convert to fraction form
   443.31/611.69 = 256.82/x
3. Step 3: Cross multiply
   443.31x = 611.69 × 256.82
4. Step 4: Simplify right side
   443.31x = 157,091.81
5. Step 5: Solve for x
   x = 157,091.81/443.31
6. Step 6: Final answer
   x = 354.36