Finding the Fourth Proportional to 70.72, 105.91 and 43.63

Step by Step Solution

1. Step 1: Write the proportion equation
   70.72 : 105.91 = 43.63 : x
2. Step 2: Convert to fraction form
   70.72/105.91 = 43.63/x
3. Step 3: Cross multiply
   70.72x = 105.91 × 43.63
4. Step 4: Simplify right side
   70.72x = 4,620.48
5. Step 5: Solve for x
   x = 4,620.48/70.72
6. Step 6: Final answer
   x = 65.34