Finding the Fourth Proportional to 108.82, 163.86 and 78.59

Step by Step Solution

1. Step 1: Write the proportion equation
   108.82 : 163.86 = 78.59 : x
2. Step 2: Convert to fraction form
   108.82/163.86 = 78.59/x
3. Step 3: Cross multiply
   108.82x = 163.86 × 78.59
4. Step 4: Simplify right side
   108.82x = 12,877.76
5. Step 5: Solve for x
   x = 12,877.76/108.82
6. Step 6: Final answer
   x = 118.35