Finding the Fourth Proportional to 111.51, 167.20 and 42.99

Step by Step Solution

1. Step 1: Write the proportion equation
   111.51 : 167.20 = 42.99 : x
2. Step 2: Convert to fraction form
   111.51/167.20 = 42.99/x
3. Step 3: Cross multiply
   111.51x = 167.20 × 42.99
4. Step 4: Simplify right side
   111.51x = 7,187.82
5. Step 5: Solve for x
   x = 7,187.82/111.51
6. Step 6: Final answer
   x = 64.46