Finding the Fourth Proportional to 3,819.72, 5,729.43 and 2,239.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,819.72 : 5,729.43 = 2,239.31 : x
2. Step 2: Convert to fraction form
   3,819.72/5,729.43 = 2,239.31/x
3. Step 3: Cross multiply
   3,819.72x = 5,729.43 × 2,239.31
4. Step 4: Simplify right side
   3,819.72x = 12,829,992.61
5. Step 5: Solve for x
   x = 12,829,992.61/3,819.72
6. Step 6: Final answer
   x = 3,358.88