Finding the Fourth Proportional to 128.22, 192.18 and 67.38

Step by Step Solution

1. Step 1: Write the proportion equation
   128.22 : 192.18 = 67.38 : x
2. Step 2: Convert to fraction form
   128.22/192.18 = 67.38/x
3. Step 3: Cross multiply
   128.22x = 192.18 × 67.38
4. Step 4: Simplify right side
   128.22x = 12,949.09
5. Step 5: Solve for x
   x = 12,949.09/128.22
6. Step 6: Final answer
   x = 100.99