Finding the Fourth Proportional to 123.98, 186.15 and 111.92

Step by Step Solution

1. Step 1: Write the proportion equation
   123.98 : 186.15 = 111.92 : x
2. Step 2: Convert to fraction form
   123.98/186.15 = 111.92/x
3. Step 3: Cross multiply
   123.98x = 186.15 × 111.92
4. Step 4: Simplify right side
   123.98x = 20,832.77
5. Step 5: Solve for x
   x = 20,832.77/123.98
6. Step 6: Final answer
   x = 168.03