Finding the Fourth Proportional to 139.94, 209.91 and 111.02

Step by Step Solution

1. Step 1: Write the proportion equation
   139.94 : 209.91 = 111.02 : x
2. Step 2: Convert to fraction form
   139.94/209.91 = 111.02/x
3. Step 3: Cross multiply
   139.94x = 209.91 × 111.02
4. Step 4: Simplify right side
   139.94x = 23,304.21
5. Step 5: Solve for x
   x = 23,304.21/139.94
6. Step 6: Final answer
   x = 166.53