Finding the Fourth Proportional to 123.61, 185.41 and 72.61

Step by Step Solution

1. Step 1: Write the proportion equation
   123.61 : 185.41 = 72.61 : x
2. Step 2: Convert to fraction form
   123.61/185.41 = 72.61/x
3. Step 3: Cross multiply
   123.61x = 185.41 × 72.61
4. Step 4: Simplify right side
   123.61x = 13,462.62
5. Step 5: Solve for x
   x = 13,462.62/123.61
6. Step 6: Final answer
   x = 108.91