Finding the Fourth Proportional to 139.52, 192.30 and 111.98

Step by Step Solution

1. Step 1: Write the proportion equation
   139.52 : 192.30 = 111.98 : x
2. Step 2: Convert to fraction form
   139.52/192.30 = 111.98/x
3. Step 3: Cross multiply
   139.52x = 192.30 × 111.98
4. Step 4: Simplify right side
   139.52x = 21,533.75
5. Step 5: Solve for x
   x = 21,533.75/139.52
6. Step 6: Final answer
   x = 154.34