Finding the Fourth Proportional to 111.90, 154.41 and 65.29

Step by Step Solution

1. Step 1: Write the proportion equation
   111.90 : 154.41 = 65.29 : x
2. Step 2: Convert to fraction form
   111.90/154.41 = 65.29/x
3. Step 3: Cross multiply
   111.90x = 154.41 × 65.29
4. Step 4: Simplify right side
   111.90x = 10,081.43
5. Step 5: Solve for x
   x = 10,081.43/111.90
6. Step 6: Final answer
   x = 90.09