Finding the Fourth Proportional to 83.28, 124.83 and 42.73

Step by Step Solution

1. Step 1: Write the proportion equation
   83.28 : 124.83 = 42.73 : x
2. Step 2: Convert to fraction form
   83.28/124.83 = 42.73/x
3. Step 3: Cross multiply
   83.28x = 124.83 × 42.73
4. Step 4: Simplify right side
   83.28x = 5,333.99
5. Step 5: Solve for x
   x = 5,333.99/83.28
6. Step 6: Final answer
   x = 64.05