Finding the Fourth Proportional to 2,571.72, 3,548.98 and 1,392.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,571.72 : 3,548.98 = 1,392.79 : x
2. Step 2: Convert to fraction form
   2,571.72/3,548.98 = 1,392.79/x
3. Step 3: Cross multiply
   2,571.72x = 3,548.98 × 1,392.79
4. Step 4: Simplify right side
   2,571.72x = 4,942,983.85
5. Step 5: Solve for x
   x = 4,942,983.85/2,571.72
6. Step 6: Final answer
   x = 1,922.05