Finding the Fourth Proportional to 139.94, 192.72 and 136.91

Step by Step Solution

1. Step 1: Write the proportion equation
   139.94 : 192.72 = 136.91 : x
2. Step 2: Convert to fraction form
   139.94/192.72 = 136.91/x
3. Step 3: Cross multiply
   139.94x = 192.72 × 136.91
4. Step 4: Simplify right side
   139.94x = 26,385.30
5. Step 5: Solve for x
   x = 26,385.30/139.94
6. Step 6: Final answer
   x = 188.55