Finding the Fourth Proportional to 67.80, 93.42 and 54.84

Step by Step Solution

1. Step 1: Write the proportion equation
   67.80 : 93.42 = 54.84 : x
2. Step 2: Convert to fraction form
   67.80/93.42 = 54.84/x
3. Step 3: Cross multiply
   67.80x = 93.42 × 54.84
4. Step 4: Simplify right side
   67.80x = 5,123.15
5. Step 5: Solve for x
   x = 5,123.15/67.80
6. Step 6: Final answer
   x = 75.56