Finding the Fourth Proportional to 123.42, 185.16 and 54.98

Step by Step Solution

1. Step 1: Write the proportion equation
   123.42 : 185.16 = 54.98 : x
2. Step 2: Convert to fraction form
   123.42/185.16 = 54.98/x
3. Step 3: Cross multiply
   123.42x = 185.16 × 54.98
4. Step 4: Simplify right side
   123.42x = 10,180.10
5. Step 5: Solve for x
   x = 10,180.10/123.42
6. Step 6: Final answer
   x = 82.48