Finding the Fourth Proportional to 123.71, 185.55 and 42.55

Step by Step Solution

1. Step 1: Write the proportion equation
   123.71 : 185.55 = 42.55 : x
2. Step 2: Convert to fraction form
   123.71/185.55 = 42.55/x
3. Step 3: Cross multiply
   123.71x = 185.55 × 42.55
4. Step 4: Simplify right side
   123.71x = 7,895.15
5. Step 5: Solve for x
   x = 7,895.15/123.71
6. Step 6: Final answer
   x = 63.82