Finding the Fourth Proportional to 103.91, 155.52 and 69.57

Step by Step Solution

1. Step 1: Write the proportion equation
   103.91 : 155.52 = 69.57 : x
2. Step 2: Convert to fraction form
   103.91/155.52 = 69.57/x
3. Step 3: Cross multiply
   103.91x = 155.52 × 69.57
4. Step 4: Simplify right side
   103.91x = 10,819.53
5. Step 5: Solve for x
   x = 10,819.53/103.91
6. Step 6: Final answer
   x = 104.13