Finding the Fourth Proportional to 100.55, 150.84 and 28.42

Step by Step Solution

1. Step 1: Write the proportion equation
   100.55 : 150.84 = 28.42 : x
2. Step 2: Convert to fraction form
   100.55/150.84 = 28.42/x
3. Step 3: Cross multiply
   100.55x = 150.84 × 28.42
4. Step 4: Simplify right side
   100.55x = 4,286.50
5. Step 5: Solve for x
   x = 4,286.50/100.55
6. Step 6: Final answer
   x = 42.63