Finding the Fourth Proportional to 91.25, 136.22 and 90.37

Step by Step Solution

1. Step 1: Write the proportion equation
   91.25 : 136.22 = 90.37 : x
2. Step 2: Convert to fraction form
   91.25/136.22 = 90.37/x
3. Step 3: Cross multiply
   91.25x = 136.22 × 90.37
4. Step 4: Simplify right side
   91.25x = 12,310.20
5. Step 5: Solve for x
   x = 12,310.20/91.25
6. Step 6: Final answer
   x = 134.91