Finding the Fourth Proportional to 13,858.56, 20,786.22 and 3,469.50

Step by Step Solution

1. Step 1: Write the proportion equation
   13,858.56 : 20,786.22 = 3,469.50 : x
2. Step 2: Convert to fraction form
   13,858.56/20,786.22 = 3,469.50/x
3. Step 3: Cross multiply
   13,858.56x = 20,786.22 × 3,469.50
4. Step 4: Simplify right side
   13,858.56x = 72,117,790.29
5. Step 5: Solve for x
   x = 72,117,790.29/13,858.56
6. Step 6: Final answer
   x = 5,203.84