Finding the Fourth Proportional to 111.64, 167.37 and 43.15

Step by Step Solution

1. Step 1: Write the proportion equation
   111.64 : 167.37 = 43.15 : x
2. Step 2: Convert to fraction form
   111.64/167.37 = 43.15/x
3. Step 3: Cross multiply
   111.64x = 167.37 × 43.15
4. Step 4: Simplify right side
   111.64x = 7,222.02
5. Step 5: Solve for x
   x = 7,222.02/111.64
6. Step 6: Final answer
   x = 64.69