Finding the Fourth Proportional to 82.53, 123.79 and 28.42

Step by Step Solution

1. Step 1: Write the proportion equation
   82.53 : 123.79 = 28.42 : x
2. Step 2: Convert to fraction form
   82.53/123.79 = 28.42/x
3. Step 3: Cross multiply
   82.53x = 123.79 × 28.42
4. Step 4: Simplify right side
   82.53x = 3,517.91
5. Step 5: Solve for x
   x = 3,517.91/82.53
6. Step 6: Final answer
   x = 42.63