Finding the Fourth Proportional to 13,978.37, 20,963.23 and 5,217.41

Step by Step Solution

1. Step 1: Write the proportion equation
   13,978.37 : 20,963.23 = 5,217.41 : x
2. Step 2: Convert to fraction form
   13,978.37/20,963.23 = 5,217.41/x
3. Step 3: Cross multiply
   13,978.37x = 20,963.23 × 5,217.41
4. Step 4: Simplify right side
   13,978.37x = 109,373,765.83
5. Step 5: Solve for x
   x = 109,373,765.83/13,978.37
6. Step 6: Final answer
   x = 7,824.50