Finding the Fourth Proportional to 85.42, 127.86 and 67.42

Step by Step Solution

1. Step 1: Write the proportion equation
   85.42 : 127.86 = 67.42 : x
2. Step 2: Convert to fraction form
   85.42/127.86 = 67.42/x
3. Step 3: Cross multiply
   85.42x = 127.86 × 67.42
4. Step 4: Simplify right side
   85.42x = 8,620.32
5. Step 5: Solve for x
   x = 8,620.32/85.42
6. Step 6: Final answer
   x = 100.92