Finding the Fourth Proportional to 123.68, 185.60 and 72.42

Step by Step Solution

1. Step 1: Write the proportion equation
   123.68 : 185.60 = 72.42 : x
2. Step 2: Convert to fraction form
   123.68/185.60 = 72.42/x
3. Step 3: Cross multiply
   123.68x = 185.60 × 72.42
4. Step 4: Simplify right side
   123.68x = 13,441.25
5. Step 5: Solve for x
   x = 13,441.25/123.68
6. Step 6: Final answer
   x = 108.68