Finding the Fourth Proportional to 67.97, 101.78 and 53.42

Step by Step Solution

1. Step 1: Write the proportion equation
   67.97 : 101.78 = 53.42 : x
2. Step 2: Convert to fraction form
   67.97/101.78 = 53.42/x
3. Step 3: Cross multiply
   67.97x = 101.78 × 53.42
4. Step 4: Simplify right side
   67.97x = 5,436.31
5. Step 5: Solve for x
   x = 5,436.31/67.97
6. Step 6: Final answer
   x = 79.99