Finding the Fourth Proportional to 111.37, 153.67 and 64.72

Step by Step Solution

1. Step 1: Write the proportion equation
   111.37 : 153.67 = 64.72 : x
2. Step 2: Convert to fraction form
   111.37/153.67 = 64.72/x
3. Step 3: Cross multiply
   111.37x = 153.67 × 64.72
4. Step 4: Simplify right side
   111.37x = 9,944.81
5. Step 5: Solve for x
   x = 9,944.81/111.37
6. Step 6: Final answer
   x = 89.30