Finding the Fourth Proportional to 128.42, 192.72 and 67.58

Step by Step Solution

1. Step 1: Write the proportion equation
   128.42 : 192.72 = 67.58 : x
2. Step 2: Convert to fraction form
   128.42/192.72 = 67.58/x
3. Step 3: Cross multiply
   128.42x = 192.72 × 67.58
4. Step 4: Simplify right side
   128.42x = 13,024.02
5. Step 5: Solve for x
   x = 13,024.02/128.42
6. Step 6: Final answer
   x = 101.42