Finding the Fourth Proportional to 105.47, 158.21 and 69.43

Step by Step Solution

1. Step 1: Write the proportion equation
   105.47 : 158.21 = 69.43 : x
2. Step 2: Convert to fraction form
   105.47/158.21 = 69.43/x
3. Step 3: Cross multiply
   105.47x = 158.21 × 69.43
4. Step 4: Simplify right side
   105.47x = 10,983.78
5. Step 5: Solve for x
   x = 10,983.78/105.47
6. Step 6: Final answer
   x = 104.14