Finding the Fourth Proportional to 139.25, 208.46 and 111.98

Step by Step Solution

1. Step 1: Write the proportion equation
   139.25 : 208.46 = 111.98 : x
2. Step 2: Convert to fraction form
   139.25/208.46 = 111.98/x
3. Step 3: Cross multiply
   139.25x = 208.46 × 111.98
4. Step 4: Simplify right side
   139.25x = 23,341.75
5. Step 5: Solve for x
   x = 23,341.75/139.25
6. Step 6: Final answer
   x = 167.63