Finding the Fourth Proportional to 67.55, 101.31 and 54.18

Step by Step Solution

1. Step 1: Write the proportion equation
   67.55 : 101.31 = 54.18 : x
2. Step 2: Convert to fraction form
   67.55/101.31 = 54.18/x
3. Step 3: Cross multiply
   67.55x = 101.31 × 54.18
4. Step 4: Simplify right side
   67.55x = 5,488.98
5. Step 5: Solve for x
   x = 5,488.98/67.55
6. Step 6: Final answer
   x = 81.26