Finding the Fourth Proportional to 67.31, 100.87 and 38.42

Step by Step Solution

1. Step 1: Write the proportion equation
   67.31 : 100.87 = 38.42 : x
2. Step 2: Convert to fraction form
   67.31/100.87 = 38.42/x
3. Step 3: Cross multiply
   67.31x = 100.87 × 38.42
4. Step 4: Simplify right side
   67.31x = 3,875.17
5. Step 5: Solve for x
   x = 3,875.17/67.31
6. Step 6: Final answer
   x = 57.57