Finding the Fourth Proportional to 67.32, 100.55 and 53.76

Step by Step Solution

1. Step 1: Write the proportion equation
   67.32 : 100.55 = 53.76 : x
2. Step 2: Convert to fraction form
   67.32/100.55 = 53.76/x
3. Step 3: Cross multiply
   67.32x = 100.55 × 53.76
4. Step 4: Simplify right side
   67.32x = 5,405.30
5. Step 5: Solve for x
   x = 5,405.30/67.32
6. Step 6: Final answer
   x = 80.29