Finding the Fourth Proportional to 108.45, 162.69 and 31.42

Step by Step Solution

1. Step 1: Write the proportion equation
   108.45 : 162.69 = 31.42 : x
2. Step 2: Convert to fraction form
   108.45/162.69 = 31.42/x
3. Step 3: Cross multiply
   108.45x = 162.69 × 31.42
4. Step 4: Simplify right side
   108.45x = 5,111.56
5. Step 5: Solve for x
   x = 5,111.56/108.45
6. Step 6: Final answer
   x = 47.13