Finding the Fourth Proportional to 85.89, 118.18 and 83.50

Step by Step Solution

1. Step 1: Write the proportion equation
   85.89 : 118.18 = 83.50 : x
2. Step 2: Convert to fraction form
   85.89/118.18 = 83.50/x
3. Step 3: Cross multiply
   85.89x = 118.18 × 83.50
4. Step 4: Simplify right side
   85.89x = 9,868.03
5. Step 5: Solve for x
   x = 9,868.03/85.89
6. Step 6: Final answer
   x = 114.89