Finding the Fourth Proportional to 70.72, 105.98 and 40.24

Step by Step Solution

1. Step 1: Write the proportion equation
   70.72 : 105.98 = 40.24 : x
2. Step 2: Convert to fraction form
   70.72/105.98 = 40.24/x
3. Step 3: Cross multiply
   70.72x = 105.98 × 40.24
4. Step 4: Simplify right side
   70.72x = 4,264.47
5. Step 5: Solve for x
   x = 4,264.47/70.72
6. Step 6: Final answer
   x = 60.30