Finding the Fourth Proportional to 123.87, 185.81 and 42.71

Step by Step Solution

1. Step 1: Write the proportion equation
   123.87 : 185.81 = 42.71 : x
2. Step 2: Convert to fraction form
   123.87/185.81 = 42.71/x
3. Step 3: Cross multiply
   123.87x = 185.81 × 42.71
4. Step 4: Simplify right side
   123.87x = 7,936.83
5. Step 5: Solve for x
   x = 7,936.83/123.87
6. Step 6: Final answer
   x = 64.07