Finding the Fourth Proportional to 111.15, 153.39 and 64.52

Step by Step Solution

1. Step 1: Write the proportion equation
   111.15 : 153.39 = 64.52 : x
2. Step 2: Convert to fraction form
   111.15/153.39 = 64.52/x
3. Step 3: Cross multiply
   111.15x = 153.39 × 64.52
4. Step 4: Simplify right side
   111.15x = 9,896.72
5. Step 5: Solve for x
   x = 9,896.72/111.15
6. Step 6: Final answer
   x = 89.04