Finding the Fourth Proportional to 67.12, 100.69 and 31.05

Step by Step Solution

1. Step 1: Write the proportion equation
   67.12 : 100.69 = 31.05 : x
2. Step 2: Convert to fraction form
   67.12/100.69 = 31.05/x
3. Step 3: Cross multiply
   67.12x = 100.69 × 31.05
4. Step 4: Simplify right side
   67.12x = 3,126.42
5. Step 5: Solve for x
   x = 3,126.42/67.12
6. Step 6: Final answer
   x = 46.58