Finding the Fourth Proportional to 139.91, 193.00 and 90.82

Step by Step Solution

1. Step 1: Write the proportion equation
   139.91 : 193.00 = 90.82 : x
2. Step 2: Convert to fraction form
   139.91/193.00 = 90.82/x
3. Step 3: Cross multiply
   139.91x = 193.00 × 90.82
4. Step 4: Simplify right side
   139.91x = 17,527.81
5. Step 5: Solve for x
   x = 17,527.81/139.91
6. Step 6: Final answer
   x = 125.28