Finding the Fourth Proportional to 67.10, 100.67 and 39.31

Step by Step Solution

1. Step 1: Write the proportion equation
   67.10 : 100.67 = 39.31 : x
2. Step 2: Convert to fraction form
   67.10/100.67 = 39.31/x
3. Step 3: Cross multiply
   67.10x = 100.67 × 39.31
4. Step 4: Simplify right side
   67.10x = 3,957.34
5. Step 5: Solve for x
   x = 3,957.34/67.10
6. Step 6: Final answer
   x = 58.98