Finding the Fourth Proportional to 128.82, 193.24 and 42.17

Step by Step Solution

1. Step 1: Write the proportion equation
   128.82 : 193.24 = 42.17 : x
2. Step 2: Convert to fraction form
   128.82/193.24 = 42.17/x
3. Step 3: Cross multiply
   128.82x = 193.24 × 42.17
4. Step 4: Simplify right side
   128.82x = 8,148.02
5. Step 5: Solve for x
   x = 8,148.02/128.82
6. Step 6: Final answer
   x = 63.25