Finding the Fourth Proportional to 111.55, 167.31 and 43.13

Step by Step Solution

1. Step 1: Write the proportion equation
   111.55 : 167.31 = 43.13 : x
2. Step 2: Convert to fraction form
   111.55/167.31 = 43.13/x
3. Step 3: Cross multiply
   111.55x = 167.31 × 43.13
4. Step 4: Simplify right side
   111.55x = 7,216.08
5. Step 5: Solve for x
   x = 7,216.08/111.55
6. Step 6: Final answer
   x = 64.69