Finding the Fourth Proportional to 111.32, 153.59 and 64.67

Step by Step Solution

1. Step 1: Write the proportion equation
   111.32 : 153.59 = 64.67 : x
2. Step 2: Convert to fraction form
   111.32/153.59 = 64.67/x
3. Step 3: Cross multiply
   111.32x = 153.59 × 64.67
4. Step 4: Simplify right side
   111.32x = 9,933.21
5. Step 5: Solve for x
   x = 9,933.21/111.32
6. Step 6: Final answer
   x = 89.24