Finding the Fourth Proportional to 13,986.71, 20,973.57 and 5,219.27

Step by Step Solution

1. Step 1: Write the proportion equation
   13,986.71 : 20,973.57 = 5,219.27 : x
2. Step 2: Convert to fraction form
   13,986.71/20,973.57 = 5,219.27/x
3. Step 3: Cross multiply
   13,986.71x = 20,973.57 × 5,219.27
4. Step 4: Simplify right side
   13,986.71x = 109,466,724.69
5. Step 5: Solve for x
   x = 109,466,724.69/13,986.71
6. Step 6: Final answer
   x = 7,826.48