Finding the Fourth Proportional to 67.42, 100.89 and 52.12

Step by Step Solution

1. Step 1: Write the proportion equation
   67.42 : 100.89 = 52.12 : x
2. Step 2: Convert to fraction form
   67.42/100.89 = 52.12/x
3. Step 3: Cross multiply
   67.42x = 100.89 × 52.12
4. Step 4: Simplify right side
   67.42x = 5,258.39
5. Step 5: Solve for x
   x = 5,258.39/67.42
6. Step 6: Final answer
   x = 77.99