Finding the Fourth Proportional to 108.52, 162.08 and 105.78

Step by Step Solution

1. Step 1: Write the proportion equation
   108.52 : 162.08 = 105.78 : x
2. Step 2: Convert to fraction form
   108.52/162.08 = 105.78/x
3. Step 3: Cross multiply
   108.52x = 162.08 × 105.78
4. Step 4: Simplify right side
   108.52x = 17,145.30
5. Step 5: Solve for x
   x = 17,145.30/108.52
6. Step 6: Final answer
   x = 158.00