Finding the Fourth Proportional to 111.81, 154.30 and 65.18

Step by Step Solution

1. Step 1: Write the proportion equation
   111.81 : 154.30 = 65.18 : x
2. Step 2: Convert to fraction form
   111.81/154.30 = 65.18/x
3. Step 3: Cross multiply
   111.81x = 154.30 × 65.18
4. Step 4: Simplify right side
   111.81x = 10,056.71
5. Step 5: Solve for x
   x = 10,056.71/111.81
6. Step 6: Final answer
   x = 89.95