Finding the Fourth Proportional to 105.28, 157.71 and 69.10

Step by Step Solution

1. Step 1: Write the proportion equation
   105.28 : 157.71 = 69.10 : x
2. Step 2: Convert to fraction form
   105.28/157.71 = 69.10/x
3. Step 3: Cross multiply
   105.28x = 157.71 × 69.10
4. Step 4: Simplify right side
   105.28x = 10,897.76
5. Step 5: Solve for x
   x = 10,897.76/105.28
6. Step 6: Final answer
   x = 103.51