Finding the Fourth Proportional to 128.43, 192.42 and 67.37

Step by Step Solution

1. Step 1: Write the proportion equation
   128.43 : 192.42 = 67.37 : x
2. Step 2: Convert to fraction form
   128.43/192.42 = 67.37/x
3. Step 3: Cross multiply
   128.43x = 192.42 × 67.37
4. Step 4: Simplify right side
   128.43x = 12,962.37
5. Step 5: Solve for x
   x = 12,962.37/128.43
6. Step 6: Final answer
   x = 100.93