Finding the Fourth Proportional to 13,308.72, 19,960.64 and 3,447.37

Step by Step Solution

1. Step 1: Write the proportion equation
   13,308.72 : 19,960.64 = 3,447.37 : x
2. Step 2: Convert to fraction form
   13,308.72/19,960.64 = 3,447.37/x
3. Step 3: Cross multiply
   13,308.72x = 19,960.64 × 3,447.37
4. Step 4: Simplify right side
   13,308.72x = 68,811,711.52
5. Step 5: Solve for x
   x = 68,811,711.52/13,308.72
6. Step 6: Final answer
   x = 5,170.42