Finding the Fourth Proportional to 108.69, 162.72 and 82.86

Step by Step Solution

1. Step 1: Write the proportion equation
   108.69 : 162.72 = 82.86 : x
2. Step 2: Convert to fraction form
   108.69/162.72 = 82.86/x
3. Step 3: Cross multiply
   108.69x = 162.72 × 82.86
4. Step 4: Simplify right side
   108.69x = 13,482.98
5. Step 5: Solve for x
   x = 13,482.98/108.69
6. Step 6: Final answer
   x = 124.05