Finding the Fourth Proportional to 12,912.72, 19,367.06 and 3,553.44

Step by Step Solution

1. Step 1: Write the proportion equation
   12,912.72 : 19,367.06 = 3,553.44 : x
2. Step 2: Convert to fraction form
   12,912.72/19,367.06 = 3,553.44/x
3. Step 3: Cross multiply
   12,912.72x = 19,367.06 × 3,553.44
4. Step 4: Simplify right side
   12,912.72x = 68,819,667.92
5. Step 5: Solve for x
   x = 68,819,667.92/12,912.72
6. Step 6: Final answer
   x = 5,329.60