Finding the Fourth Proportional to 111.61, 154.06 and 70.17

Step by Step Solution

1. Step 1: Write the proportion equation
   111.61 : 154.06 = 70.17 : x
2. Step 2: Convert to fraction form
   111.61/154.06 = 70.17/x
3. Step 3: Cross multiply
   111.61x = 154.06 × 70.17
4. Step 4: Simplify right side
   111.61x = 10,810.78
5. Step 5: Solve for x
   x = 10,810.78/111.61
6. Step 6: Final answer
   x = 96.86