Finding the Fourth Proportional to 139.85, 193.06 and 108.69

Step by Step Solution

1. Step 1: Write the proportion equation
   139.85 : 193.06 = 108.69 : x
2. Step 2: Convert to fraction form
   139.85/193.06 = 108.69/x
3. Step 3: Cross multiply
   139.85x = 193.06 × 108.69
4. Step 4: Simplify right side
   139.85x = 20,983.69
5. Step 5: Solve for x
   x = 20,983.69/139.85
6. Step 6: Final answer
   x = 150.04