Finding the Fourth Proportional to 123.51, 185.31 and 111.81

Step by Step Solution

1. Step 1: Write the proportion equation
   123.51 : 185.31 = 111.81 : x
2. Step 2: Convert to fraction form
   123.51/185.31 = 111.81/x
3. Step 3: Cross multiply
   123.51x = 185.31 × 111.81
4. Step 4: Simplify right side
   123.51x = 20,719.51
5. Step 5: Solve for x
   x = 20,719.51/123.51
6. Step 6: Final answer
   x = 167.76