Finding the Fourth Proportional to 100.73, 139.06 and 65.82

Step by Step Solution

1. Step 1: Write the proportion equation
   100.73 : 139.06 = 65.82 : x
2. Step 2: Convert to fraction form
   100.73/139.06 = 65.82/x
3. Step 3: Cross multiply
   100.73x = 139.06 × 65.82
4. Step 4: Simplify right side
   100.73x = 9,152.49
5. Step 5: Solve for x
   x = 9,152.49/100.73
6. Step 6: Final answer
   x = 90.87