Finding the Fourth Proportional to 111.45, 153.81 and 64.83

Step by Step Solution

1. Step 1: Write the proportion equation
   111.45 : 153.81 = 64.83 : x
2. Step 2: Convert to fraction form
   111.45/153.81 = 64.83/x
3. Step 3: Cross multiply
   111.45x = 153.81 × 64.83
4. Step 4: Simplify right side
   111.45x = 9,971.50
5. Step 5: Solve for x
   x = 9,971.50/111.45
6. Step 6: Final answer
   x = 89.47