Finding the Fourth Proportional to 111.48, 153.82 and 64.85

Step by Step Solution

1. Step 1: Write the proportion equation
   111.48 : 153.82 = 64.85 : x
2. Step 2: Convert to fraction form
   111.48/153.82 = 64.85/x
3. Step 3: Cross multiply
   111.48x = 153.82 × 64.85
4. Step 4: Simplify right side
   111.48x = 9,975.59
5. Step 5: Solve for x
   x = 9,975.59/111.48
6. Step 6: Final answer
   x = 89.49