Finding the Fourth Proportional to 108.83, 162.90 and 89.25

Step by Step Solution

1. Step 1: Write the proportion equation
   108.83 : 162.90 = 89.25 : x
2. Step 2: Convert to fraction form
   108.83/162.90 = 89.25/x
3. Step 3: Cross multiply
   108.83x = 162.90 × 89.25
4. Step 4: Simplify right side
   108.83x = 14,538.83
5. Step 5: Solve for x
   x = 14,538.83/108.83
6. Step 6: Final answer
   x = 133.60