Finding the Fourth Proportional to 111.60, 153.63 and 89.73

Step by Step Solution

1. Step 1: Write the proportion equation
   111.60 : 153.63 = 89.73 : x
2. Step 2: Convert to fraction form
   111.60/153.63 = 89.73/x
3. Step 3: Cross multiply
   111.60x = 153.63 × 89.73
4. Step 4: Simplify right side
   111.60x = 13,785.22
5. Step 5: Solve for x
   x = 13,785.22/111.60
6. Step 6: Final answer
   x = 123.52