Finding the Fourth Proportional to 139.72, 192.84 and 100.54

Step by Step Solution

1. Step 1: Write the proportion equation
   139.72 : 192.84 = 100.54 : x
2. Step 2: Convert to fraction form
   139.72/192.84 = 100.54/x
3. Step 3: Cross multiply
   139.72x = 192.84 × 100.54
4. Step 4: Simplify right side
   139.72x = 19,388.13
5. Step 5: Solve for x
   x = 19,388.13/139.72
6. Step 6: Final answer
   x = 138.76