Finding the Fourth Proportional to 13,786.21, 20,667.61 and 5,472.10

Step by Step Solution

1. Step 1: Write the proportion equation
   13,786.21 : 20,667.61 = 5,472.10 : x
2. Step 2: Convert to fraction form
   13,786.21/20,667.61 = 5,472.10/x
3. Step 3: Cross multiply
   13,786.21x = 20,667.61 × 5,472.10
4. Step 4: Simplify right side
   13,786.21x = 113,095,228.68
5. Step 5: Solve for x
   x = 113,095,228.68/13,786.21
6. Step 6: Final answer
   x = 8,203.50