Finding the Fourth Proportional to 100.82, 151.17 and 42.23

Step by Step Solution

1. Step 1: Write the proportion equation
   100.82 : 151.17 = 42.23 : x
2. Step 2: Convert to fraction form
   100.82/151.17 = 42.23/x
3. Step 3: Cross multiply
   100.82x = 151.17 × 42.23
4. Step 4: Simplify right side
   100.82x = 6,383.15
5. Step 5: Solve for x
   x = 6,383.15/100.82
6. Step 6: Final answer
   x = 63.32