Finding the Fourth Proportional to 111.55, 153.96 and 70.15

Step by Step Solution

1. Step 1: Write the proportion equation
   111.55 : 153.96 = 70.15 : x
2. Step 2: Convert to fraction form
   111.55/153.96 = 70.15/x
3. Step 3: Cross multiply
   111.55x = 153.96 × 70.15
4. Step 4: Simplify right side
   111.55x = 10,800.29
5. Step 5: Solve for x
   x = 10,800.29/111.55
6. Step 6: Final answer
   x = 96.82