Finding the Fourth Proportional to 100.82, 139.23 and 92.63

Step by Step Solution

1. Step 1: Write the proportion equation
   100.82 : 139.23 = 92.63 : x
2. Step 2: Convert to fraction form
   100.82/139.23 = 92.63/x
3. Step 3: Cross multiply
   100.82x = 139.23 × 92.63
4. Step 4: Simplify right side
   100.82x = 12,896.18
5. Step 5: Solve for x
   x = 12,896.18/100.82
6. Step 6: Final answer
   x = 127.92