Finding the Fourth Proportional to 67.16, 100.55 and 39.98

Step by Step Solution

1. Step 1: Write the proportion equation
   67.16 : 100.55 = 39.98 : x
2. Step 2: Convert to fraction form
   67.16/100.55 = 39.98/x
3. Step 3: Cross multiply
   67.16x = 100.55 × 39.98
4. Step 4: Simplify right side
   67.16x = 4,019.99
5. Step 5: Solve for x
   x = 4,019.99/67.16
6. Step 6: Final answer
   x = 59.86