Finding the Fourth Proportional to 111.69, 167.54 and 43.20

Step by Step Solution

1. Step 1: Write the proportion equation
   111.69 : 167.54 = 43.20 : x
2. Step 2: Convert to fraction form
   111.69/167.54 = 43.20/x
3. Step 3: Cross multiply
   111.69x = 167.54 × 43.20
4. Step 4: Simplify right side
   111.69x = 7,237.51
5. Step 5: Solve for x
   x = 7,237.51/111.69
6. Step 6: Final answer
   x = 64.80