Finding the Fourth Proportional to 111.94, 154.45 and 65.30

Step by Step Solution

1. Step 1: Write the proportion equation
   111.94 : 154.45 = 65.30 : x
2. Step 2: Convert to fraction form
   111.94/154.45 = 65.30/x
3. Step 3: Cross multiply
   111.94x = 154.45 × 65.30
4. Step 4: Simplify right side
   111.94x = 10,085.75
5. Step 5: Solve for x
   x = 10,085.75/111.94
6. Step 6: Final answer
   x = 90.10