Finding the Fourth Proportional to 111.94, 154.47 and 65.31

Step by Step Solution

1. Step 1: Write the proportion equation
   111.94 : 154.47 = 65.31 : x
2. Step 2: Convert to fraction form
   111.94/154.47 = 65.31/x
3. Step 3: Cross multiply
   111.94x = 154.47 × 65.31
4. Step 4: Simplify right side
   111.94x = 10,088.44
5. Step 5: Solve for x
   x = 10,088.44/111.94
6. Step 6: Final answer
   x = 90.12