Finding the Fourth Proportional to 67.89, 93.71 and 42

Step by Step Solution

1. Step 1: Write the proportion equation
   67.89 : 93.71 = 42 : x
2. Step 2: Convert to fraction form
   67.89/93.71 = 42/x
3. Step 3: Cross multiply
   67.89x = 93.71 × 42
4. Step 4: Simplify right side
   67.89x = 3,935.61
5. Step 5: Solve for x
   x = 3,935.61/67.89
6. Step 6: Final answer
   x = 57.97