Finding the Fourth Proportional to 67.76, 101.78 and 53.33

Step by Step Solution

1. Step 1: Write the proportion equation
   67.76 : 101.78 = 53.33 : x
2. Step 2: Convert to fraction form
   67.76/101.78 = 53.33/x
3. Step 3: Cross multiply
   67.76x = 101.78 × 53.33
4. Step 4: Simplify right side
   67.76x = 5,428.32
5. Step 5: Solve for x
   x = 5,428.32/67.76
6. Step 6: Final answer
   x = 80.12