Finding the Fourth Proportional to 139.34, 192.33 and 92.78

Step by Step Solution

1. Step 1: Write the proportion equation
   139.34 : 192.33 = 92.78 : x
2. Step 2: Convert to fraction form
   139.34/192.33 = 92.78/x
3. Step 3: Cross multiply
   139.34x = 192.33 × 92.78
4. Step 4: Simplify right side
   139.34x = 17,844.38
5. Step 5: Solve for x
   x = 17,844.38/139.34
6. Step 6: Final answer
   x = 128.06