Finding the Fourth Proportional to 128.32, 192.48 and 42.82

Step by Step Solution

1. Step 1: Write the proportion equation
   128.32 : 192.48 = 42.82 : x
2. Step 2: Convert to fraction form
   128.32/192.48 = 42.82/x
3. Step 3: Cross multiply
   128.32x = 192.48 × 42.82
4. Step 4: Simplify right side
   128.32x = 8,241.35
5. Step 5: Solve for x
   x = 8,241.35/128.32
6. Step 6: Final answer
   x = 64.23