Finding the Fourth Proportional to 80.84, 111.59 and 51.34

Step by Step Solution

1. Step 1: Write the proportion equation
   80.84 : 111.59 = 51.34 : x
2. Step 2: Convert to fraction form
   80.84/111.59 = 51.34/x
3. Step 3: Cross multiply
   80.84x = 111.59 × 51.34
4. Step 4: Simplify right side
   80.84x = 5,729.03
5. Step 5: Solve for x
   x = 5,729.03/80.84
6. Step 6: Final answer
   x = 70.87