Finding the Fourth Proportional to 67.12, 100.63 and 53.62

Step by Step Solution

1. Step 1: Write the proportion equation
   67.12 : 100.63 = 53.62 : x
2. Step 2: Convert to fraction form
   67.12/100.63 = 53.62/x
3. Step 3: Cross multiply
   67.12x = 100.63 × 53.62
4. Step 4: Simplify right side
   67.12x = 5,395.78
5. Step 5: Solve for x
   x = 5,395.78/67.12
6. Step 6: Final answer
   x = 80.39