Finding the Fourth Proportional to 109.25, 150.59 and 90.80

Step by Step Solution

1. Step 1: Write the proportion equation
   109.25 : 150.59 = 90.80 : x
2. Step 2: Convert to fraction form
   109.25/150.59 = 90.80/x
3. Step 3: Cross multiply
   109.25x = 150.59 × 90.80
4. Step 4: Simplify right side
   109.25x = 13,672.37
5. Step 5: Solve for x
   x = 13,672.37/109.25
6. Step 6: Final answer
   x = 125.15