Finding the Fourth Proportional to 128.41, 192.69 and 67.56

Step by Step Solution

1. Step 1: Write the proportion equation
   128.41 : 192.69 = 67.56 : x
2. Step 2: Convert to fraction form
   128.41/192.69 = 67.56/x
3. Step 3: Cross multiply
   128.41x = 192.69 × 67.56
4. Step 4: Simplify right side
   128.41x = 13,018.14
5. Step 5: Solve for x
   x = 13,018.14/128.41
6. Step 6: Final answer
   x = 101.38