Finding the Fourth Proportional to 109.56, 151.32 and 89.94

Step by Step Solution

1. Step 1: Write the proportion equation
   109.56 : 151.32 = 89.94 : x
2. Step 2: Convert to fraction form
   109.56/151.32 = 89.94/x
3. Step 3: Cross multiply
   109.56x = 151.32 × 89.94
4. Step 4: Simplify right side
   109.56x = 13,609.72
5. Step 5: Solve for x
   x = 13,609.72/109.56
6. Step 6: Final answer
   x = 124.22