Finding the Fourth Proportional to 404.50, 606.75 and 100.50

Step by Step Solution

1. Step 1: Write the proportion equation
   404.50 : 606.75 = 100.50 : x
2. Step 2: Convert to fraction form
   404.50/606.75 = 100.50/x
3. Step 3: Cross multiply
   404.50x = 606.75 × 100.50
4. Step 4: Simplify right side
   404.50x = 60,978.38
5. Step 5: Solve for x
   x = 60,978.38/404.50
6. Step 6: Final answer
   x = 150.75