Finding the Fourth Proportional to 100.54, 150.05 and 90.82

Step by Step Solution

1. Step 1: Write the proportion equation
   100.54 : 150.05 = 90.82 : x
2. Step 2: Convert to fraction form
   100.54/150.05 = 90.82/x
3. Step 3: Cross multiply
   100.54x = 150.05 × 90.82
4. Step 4: Simplify right side
   100.54x = 13,627.96
5. Step 5: Solve for x
   x = 13,627.96/100.54
6. Step 6: Final answer
   x = 135.55