Finding the Fourth Proportional to 69.89, 104.83 and 18.53

Step by Step Solution

1. Step 1: Write the proportion equation
   69.89 : 104.83 = 18.53 : x
2. Step 2: Convert to fraction form
   69.89/104.83 = 18.53/x
3. Step 3: Cross multiply
   69.89x = 104.83 × 18.53
4. Step 4: Simplify right side
   69.89x = 1,942.41
5. Step 5: Solve for x
   x = 1,942.41/69.89
6. Step 6: Final answer
   x = 27.79