Finding the Fourth Proportional to 139.94, 209.84 and 42.42

Step by Step Solution

1. Step 1: Write the proportion equation
   139.94 : 209.84 = 42.42 : x
2. Step 2: Convert to fraction form
   139.94/209.84 = 42.42/x
3. Step 3: Cross multiply
   139.94x = 209.84 × 42.42
4. Step 4: Simplify right side
   139.94x = 8,900.94
5. Step 5: Solve for x
   x = 8,900.94/139.94
6. Step 6: Final answer
   x = 63.61