Finding the Fourth Proportional to 139.12, 191.72 and 106.32

Step by Step Solution

1. Step 1: Write the proportion equation
   139.12 : 191.72 = 106.32 : x
2. Step 2: Convert to fraction form
   139.12/191.72 = 106.32/x
3. Step 3: Cross multiply
   139.12x = 191.72 × 106.32
4. Step 4: Simplify right side
   139.12x = 20,383.67
5. Step 5: Solve for x
   x = 20,383.67/139.12
6. Step 6: Final answer
   x = 146.52