Finding the Fourth Proportional to 13,164.40, 19,747.59 and 4,399.30

Step by Step Solution

1. Step 1: Write the proportion equation
   13,164.40 : 19,747.59 = 4,399.30 : x
2. Step 2: Convert to fraction form
   13,164.40/19,747.59 = 4,399.30/x
3. Step 3: Cross multiply
   13,164.40x = 19,747.59 × 4,399.30
4. Step 4: Simplify right side
   13,164.40x = 86,875,572.69
5. Step 5: Solve for x
   x = 86,875,572.69/13,164.40
6. Step 6: Final answer
   x = 6,599.28