Finding the Fourth Proportional to 123.91, 185.87 and 42.73

Step by Step Solution

1. Step 1: Write the proportion equation
   123.91 : 185.87 = 42.73 : x
2. Step 2: Convert to fraction form
   123.91/185.87 = 42.73/x
3. Step 3: Cross multiply
   123.91x = 185.87 × 42.73
4. Step 4: Simplify right side
   123.91x = 7,941.30
5. Step 5: Solve for x
   x = 7,941.30/123.91
6. Step 6: Final answer
   x = 64.09