Finding the Fourth Proportional to 116.05, 173.82 and 90.17

Step by Step Solution

1. Step 1: Write the proportion equation
   116.05 : 173.82 = 90.17 : x
2. Step 2: Convert to fraction form
   116.05/173.82 = 90.17/x
3. Step 3: Cross multiply
   116.05x = 173.82 × 90.17
4. Step 4: Simplify right side
   116.05x = 15,672.03
5. Step 5: Solve for x
   x = 15,672.03/116.05
6. Step 6: Final answer
   x = 135.05