Finding the Fourth Proportional to 100.82, 139.38 and 96.55

Step by Step Solution

1. Step 1: Write the proportion equation
   100.82 : 139.38 = 96.55 : x
2. Step 2: Convert to fraction form
   100.82/139.38 = 96.55/x
3. Step 3: Cross multiply
   100.82x = 139.38 × 96.55
4. Step 4: Simplify right side
   100.82x = 13,457.14
5. Step 5: Solve for x
   x = 13,457.14/100.82
6. Step 6: Final answer
   x = 133.48