Finding the Fourth Proportional to 320.53, 480.83 and 89.42

Step by Step Solution

1. Step 1: Write the proportion equation
   320.53 : 480.83 = 89.42 : x
2. Step 2: Convert to fraction form
   320.53/480.83 = 89.42/x
3. Step 3: Cross multiply
   320.53x = 480.83 × 89.42
4. Step 4: Simplify right side
   320.53x = 42,995.82
5. Step 5: Solve for x
   x = 42,995.82/320.53
6. Step 6: Final answer
   x = 134.14