Finding the Fourth Proportional to 111.98, 154.38 and 70.51

Step by Step Solution

1. Step 1: Write the proportion equation
   111.98 : 154.38 = 70.51 : x
2. Step 2: Convert to fraction form
   111.98/154.38 = 70.51/x
3. Step 3: Cross multiply
   111.98x = 154.38 × 70.51
4. Step 4: Simplify right side
   111.98x = 10,885.33
5. Step 5: Solve for x
   x = 10,885.33/111.98
6. Step 6: Final answer
   x = 97.21