Finding the Fourth Proportional to 139.03, 192.01 and 108.31

Step by Step Solution

1. Step 1: Write the proportion equation
   139.03 : 192.01 = 108.31 : x
2. Step 2: Convert to fraction form
   139.03/192.01 = 108.31/x
3. Step 3: Cross multiply
   139.03x = 192.01 × 108.31
4. Step 4: Simplify right side
   139.03x = 20,796.60
5. Step 5: Solve for x
   x = 20,796.60/139.03
6. Step 6: Final answer
   x = 149.58