Finding the Fourth Proportional to 67.14, 100.91 and 53.69

Step by Step Solution

1. Step 1: Write the proportion equation
   67.14 : 100.91 = 53.69 : x
2. Step 2: Convert to fraction form
   67.14/100.91 = 53.69/x
3. Step 3: Cross multiply
   67.14x = 100.91 × 53.69
4. Step 4: Simplify right side
   67.14x = 5,417.49
5. Step 5: Solve for x
   x = 5,417.49/67.14
6. Step 6: Final answer
   x = 80.69