Finding the Fourth Proportional to 123.72, 185.62 and 42.60

Step by Step Solution

1. Step 1: Write the proportion equation
   123.72 : 185.62 = 42.60 : x
2. Step 2: Convert to fraction form
   123.72/185.62 = 42.60/x
3. Step 3: Cross multiply
   123.72x = 185.62 × 42.60
4. Step 4: Simplify right side
   123.72x = 7,907.41
5. Step 5: Solve for x
   x = 7,907.41/123.72
6. Step 6: Final answer
   x = 63.91