Finding the Fourth Proportional to 123.91, 185.86 and 42.75

Step by Step Solution

1. Step 1: Write the proportion equation
   123.91 : 185.86 = 42.75 : x
2. Step 2: Convert to fraction form
   123.91/185.86 = 42.75/x
3. Step 3: Cross multiply
   123.91x = 185.86 × 42.75
4. Step 4: Simplify right side
   123.91x = 7,945.57
5. Step 5: Solve for x
   x = 7,945.57/123.91
6. Step 6: Final answer
   x = 64.13