Finding the Fourth Proportional to 82.72, 123.88 and 67.42

Step by Step Solution

1. Step 1: Write the proportion equation
   82.72 : 123.88 = 67.42 : x
2. Step 2: Convert to fraction form
   82.72/123.88 = 67.42/x
3. Step 3: Cross multiply
   82.72x = 123.88 × 67.42
4. Step 4: Simplify right side
   82.72x = 8,351.41
5. Step 5: Solve for x
   x = 8,351.41/82.72
6. Step 6: Final answer
   x = 100.96