Finding the Fourth Proportional to 67.86, 93.72 and 42

Step by Step Solution

1. Step 1: Write the proportion equation
   67.86 : 93.72 = 42 : x
2. Step 2: Convert to fraction form
   67.86/93.72 = 42/x
3. Step 3: Cross multiply
   67.86x = 93.72 × 42
4. Step 4: Simplify right side
   67.86x = 3,936.24
5. Step 5: Solve for x
   x = 3,936.24/67.86
6. Step 6: Final answer
   x = 58.01