Finding the Fourth Proportional to 111.32, 166.94 and 42.84

Step by Step Solution

1. Step 1: Write the proportion equation
   111.32 : 166.94 = 42.84 : x
2. Step 2: Convert to fraction form
   111.32/166.94 = 42.84/x
3. Step 3: Cross multiply
   111.32x = 166.94 × 42.84
4. Step 4: Simplify right side
   111.32x = 7,151.71
5. Step 5: Solve for x
   x = 7,151.71/111.32
6. Step 6: Final answer
   x = 64.24