Finding the Fourth Proportional to 111.71, 154.16 and 65.08

Step by Step Solution

1. Step 1: Write the proportion equation
   111.71 : 154.16 = 65.08 : x
2. Step 2: Convert to fraction form
   111.71/154.16 = 65.08/x
3. Step 3: Cross multiply
   111.71x = 154.16 × 65.08
4. Step 4: Simplify right side
   111.71x = 10,032.02
5. Step 5: Solve for x
   x = 10,032.02/111.71
6. Step 6: Final answer
   x = 89.80