Finding the Fourth Proportional to 139.42, 192.27 and 100.54

Step by Step Solution

1. Step 1: Write the proportion equation
   139.42 : 192.27 = 100.54 : x
2. Step 2: Convert to fraction form
   139.42/192.27 = 100.54/x
3. Step 3: Cross multiply
   139.42x = 192.27 × 100.54
4. Step 4: Simplify right side
   139.42x = 19,330.83
5. Step 5: Solve for x
   x = 19,330.83/139.42
6. Step 6: Final answer
   x = 138.65