Finding the Fourth Proportional to 111.37, 153.69 and 64.74

Step by Step Solution

1. Step 1: Write the proportion equation
   111.37 : 153.69 = 64.74 : x
2. Step 2: Convert to fraction form
   111.37/153.69 = 64.74/x
3. Step 3: Cross multiply
   111.37x = 153.69 × 64.74
4. Step 4: Simplify right side
   111.37x = 9,950.22
5. Step 5: Solve for x
   x = 9,950.22/111.37
6. Step 6: Final answer
   x = 89.34