Finding the Fourth Proportional to 139.82, 192.83 and 90.65

Step by Step Solution

1. Step 1: Write the proportion equation
   139.82 : 192.83 = 90.65 : x
2. Step 2: Convert to fraction form
   139.82/192.83 = 90.65/x
3. Step 3: Cross multiply
   139.82x = 192.83 × 90.65
4. Step 4: Simplify right side
   139.82x = 17,478.62
5. Step 5: Solve for x
   x = 17,478.62/139.82
6. Step 6: Final answer
   x = 125.01