Finding the Fourth Proportional to 67.42, 93.05 and 56.42

Step by Step Solution

1. Step 1: Write the proportion equation
   67.42 : 93.05 = 56.42 : x
2. Step 2: Convert to fraction form
   67.42/93.05 = 56.42/x
3. Step 3: Cross multiply
   67.42x = 93.05 × 56.42
4. Step 4: Simplify right side
   67.42x = 5,249.88
5. Step 5: Solve for x
   x = 5,249.88/67.42
6. Step 6: Final answer
   x = 77.87