Finding the Fourth Proportional to 67.36, 100.84 and 53.72

Step by Step Solution

1. Step 1: Write the proportion equation
   67.36 : 100.84 = 53.72 : x
2. Step 2: Convert to fraction form
   67.36/100.84 = 53.72/x
3. Step 3: Cross multiply
   67.36x = 100.84 × 53.72
4. Step 4: Simplify right side
   67.36x = 5,417.12
5. Step 5: Solve for x
   x = 5,417.12/67.36
6. Step 6: Final answer
   x = 80.42