Finding the Fourth Proportional to 123.94, 185.92 and 42.78

Step by Step Solution

1. Step 1: Write the proportion equation
   123.94 : 185.92 = 42.78 : x
2. Step 2: Convert to fraction form
   123.94/185.92 = 42.78/x
3. Step 3: Cross multiply
   123.94x = 185.92 × 42.78
4. Step 4: Simplify right side
   123.94x = 7,953.66
5. Step 5: Solve for x
   x = 7,953.66/123.94
6. Step 6: Final answer
   x = 64.17