Finding the Fourth Proportional to 139.83, 192.88 and 107.02

Step by Step Solution

1. Step 1: Write the proportion equation
   139.83 : 192.88 = 107.02 : x
2. Step 2: Convert to fraction form
   139.83/192.88 = 107.02/x
3. Step 3: Cross multiply
   139.83x = 192.88 × 107.02
4. Step 4: Simplify right side
   139.83x = 20,642.02
5. Step 5: Solve for x
   x = 20,642.02/139.83
6. Step 6: Final answer
   x = 147.63