Finding the Fourth Proportional to 111.91, 167.78 and 43.48

Step by Step Solution

1. Step 1: Write the proportion equation
   111.91 : 167.78 = 43.48 : x
2. Step 2: Convert to fraction form
   111.91/167.78 = 43.48/x
3. Step 3: Cross multiply
   111.91x = 167.78 × 43.48
4. Step 4: Simplify right side
   111.91x = 7,295.07
5. Step 5: Solve for x
   x = 7,295.07/111.91
6. Step 6: Final answer
   x = 65.19