Finding the Fourth Proportional to 139.27, 192.24 and 89.52

Step by Step Solution

1. Step 1: Write the proportion equation
   139.27 : 192.24 = 89.52 : x
2. Step 2: Convert to fraction form
   139.27/192.24 = 89.52/x
3. Step 3: Cross multiply
   139.27x = 192.24 × 89.52
4. Step 4: Simplify right side
   139.27x = 17,209.32
5. Step 5: Solve for x
   x = 17,209.32/139.27
6. Step 6: Final answer
   x = 123.57