Finding the Fourth Proportional to 3,927.72, 5,420.70 and 2,249.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,927.72 : 5,420.70 = 2,249.31 : x
2. Step 2: Convert to fraction form
   3,927.72/5,420.70 = 2,249.31/x
3. Step 3: Cross multiply
   3,927.72x = 5,420.70 × 2,249.31
4. Step 4: Simplify right side
   3,927.72x = 12,192,834.72
5. Step 5: Solve for x
   x = 12,192,834.72/3,927.72
6. Step 6: Final answer
   x = 3,104.30