Finding the Fourth Proportional to 100.54, 150.69 and 82.42

Step by Step Solution

1. Step 1: Write the proportion equation
   100.54 : 150.69 = 82.42 : x
2. Step 2: Convert to fraction form
   100.54/150.69 = 82.42/x
3. Step 3: Cross multiply
   100.54x = 150.69 × 82.42
4. Step 4: Simplify right side
   100.54x = 12,419.87
5. Step 5: Solve for x
   x = 12,419.87/100.54
6. Step 6: Final answer
   x = 123.53