Finding the Fourth Proportional to 123.55, 185.35 and 42.45

Step by Step Solution

1. Step 1: Write the proportion equation
   123.55 : 185.35 = 42.45 : x
2. Step 2: Convert to fraction form
   123.55/185.35 = 42.45/x
3. Step 3: Cross multiply
   123.55x = 185.35 × 42.45
4. Step 4: Simplify right side
   123.55x = 7,868.00
5. Step 5: Solve for x
   x = 7,868.00/123.55
6. Step 6: Final answer
   x = 63.68