Finding the Fourth Proportional to 300.78, 449.82 and 190.82

Step by Step Solution

1. Step 1: Write the proportion equation
   300.78 : 449.82 = 190.82 : x
2. Step 2: Convert to fraction form
   300.78/449.82 = 190.82/x
3. Step 3: Cross multiply
   300.78x = 449.82 × 190.82
4. Step 4: Simplify right side
   300.78x = 85,835.78
5. Step 5: Solve for x
   x = 85,835.78/300.78
6. Step 6: Final answer
   x = 285.38