Finding the Fourth Proportional to 139.59, 192.69 and 106.92

Step by Step Solution

1. Step 1: Write the proportion equation
   139.59 : 192.69 = 106.92 : x
2. Step 2: Convert to fraction form
   139.59/192.69 = 106.92/x
3. Step 3: Cross multiply
   139.59x = 192.69 × 106.92
4. Step 4: Simplify right side
   139.59x = 20,602.41
5. Step 5: Solve for x
   x = 20,602.41/139.59
6. Step 6: Final answer
   x = 147.59