Finding the Fourth Proportional to 69.89, 104.82 and 21.79

Step by Step Solution

1. Step 1: Write the proportion equation
   69.89 : 104.82 = 21.79 : x
2. Step 2: Convert to fraction form
   69.89/104.82 = 21.79/x
3. Step 3: Cross multiply
   69.89x = 104.82 × 21.79
4. Step 4: Simplify right side
   69.89x = 2,284.03
5. Step 5: Solve for x
   x = 2,284.03/69.89
6. Step 6: Final answer
   x = 32.68