Finding the Fourth Proportional to 139.52, 192.56 and 114.91

Step by Step Solution

1. Step 1: Write the proportion equation
   139.52 : 192.56 = 114.91 : x
2. Step 2: Convert to fraction form
   139.52/192.56 = 114.91/x
3. Step 3: Cross multiply
   139.52x = 192.56 × 114.91
4. Step 4: Simplify right side
   139.52x = 22,127.07
5. Step 5: Solve for x
   x = 22,127.07/139.52
6. Step 6: Final answer
   x = 158.59