Finding the Fourth Proportional to 13,976.82, 20,968.88 and 5,211.81

Step by Step Solution

1. Step 1: Write the proportion equation
   13,976.82 : 20,968.88 = 5,211.81 : x
2. Step 2: Convert to fraction form
   13,976.82/20,968.88 = 5,211.81/x
3. Step 3: Cross multiply
   13,976.82x = 20,968.88 × 5,211.81
4. Step 4: Simplify right side
   13,976.82x = 109,285,870.90
5. Step 5: Solve for x
   x = 109,285,870.90/13,976.82
6. Step 6: Final answer
   x = 7,819.08