Finding the Fourth Proportional to 67.98, 102.12 and 54.48

Step by Step Solution

1. Step 1: Write the proportion equation
   67.98 : 102.12 = 54.48 : x
2. Step 2: Convert to fraction form
   67.98/102.12 = 54.48/x
3. Step 3: Cross multiply
   67.98x = 102.12 × 54.48
4. Step 4: Simplify right side
   67.98x = 5,563.50
5. Step 5: Solve for x
   x = 5,563.50/67.98
6. Step 6: Final answer
   x = 81.84