Finding the Fourth Proportional to 70.72, 105.94 and 53.62

Step by Step Solution

1. Step 1: Write the proportion equation
   70.72 : 105.94 = 53.62 : x
2. Step 2: Convert to fraction form
   70.72/105.94 = 53.62/x
3. Step 3: Cross multiply
   70.72x = 105.94 × 53.62
4. Step 4: Simplify right side
   70.72x = 5,680.50
5. Step 5: Solve for x
   x = 5,680.50/70.72
6. Step 6: Final answer
   x = 80.32