Finding the Fourth Proportional to 139.62, 192.69 and 105.06

Step by Step Solution

1. Step 1: Write the proportion equation
   139.62 : 192.69 = 105.06 : x
2. Step 2: Convert to fraction form
   139.62/192.69 = 105.06/x
3. Step 3: Cross multiply
   139.62x = 192.69 × 105.06
4. Step 4: Simplify right side
   139.62x = 20,244.01
5. Step 5: Solve for x
   x = 20,244.01/139.62
6. Step 6: Final answer
   x = 144.99