Finding the Fourth Proportional to 80.72, 111.32 and 70.34

Step by Step Solution

1. Step 1: Write the proportion equation
   80.72 : 111.32 = 70.34 : x
2. Step 2: Convert to fraction form
   80.72/111.32 = 70.34/x
3. Step 3: Cross multiply
   80.72x = 111.32 × 70.34
4. Step 4: Simplify right side
   80.72x = 7,830.94
5. Step 5: Solve for x
   x = 7,830.94/80.72
6. Step 6: Final answer
   x = 97.01