Finding the Fourth Proportional to 111.32, 166.76 and 82.47

Step by Step Solution

1. Step 1: Write the proportion equation
   111.32 : 166.76 = 82.47 : x
2. Step 2: Convert to fraction form
   111.32/166.76 = 82.47/x
3. Step 3: Cross multiply
   111.32x = 166.76 × 82.47
4. Step 4: Simplify right side
   111.32x = 13,752.28
5. Step 5: Solve for x
   x = 13,752.28/111.32
6. Step 6: Final answer
   x = 123.53