Finding the Fourth Proportional to 67.28, 100.72 and 55.84

Step by Step Solution

1. Step 1: Write the proportion equation
   67.28 : 100.72 = 55.84 : x
2. Step 2: Convert to fraction form
   67.28/100.72 = 55.84/x
3. Step 3: Cross multiply
   67.28x = 100.72 × 55.84
4. Step 4: Simplify right side
   67.28x = 5,624.20
5. Step 5: Solve for x
   x = 5,624.20/67.28
6. Step 6: Final answer
   x = 83.59