Finding the Fourth Proportional to 139.55, 192.56 and 90.33

Step by Step Solution

1. Step 1: Write the proportion equation
   139.55 : 192.56 = 90.33 : x
2. Step 2: Convert to fraction form
   139.55/192.56 = 90.33/x
3. Step 3: Cross multiply
   139.55x = 192.56 × 90.33
4. Step 4: Simplify right side
   139.55x = 17,393.49
5. Step 5: Solve for x
   x = 17,393.49/139.55
6. Step 6: Final answer
   x = 124.64