Finding the Fourth Proportional to 108.15, 162.31 and 83.83

Step by Step Solution

1. Step 1: Write the proportion equation
   108.15 : 162.31 = 83.83 : x
2. Step 2: Convert to fraction form
   108.15/162.31 = 83.83/x
3. Step 3: Cross multiply
   108.15x = 162.31 × 83.83
4. Step 4: Simplify right side
   108.15x = 13,606.43
5. Step 5: Solve for x
   x = 13,606.43/108.15
6. Step 6: Final answer
   x = 125.81