Finding the Fourth Proportional to 2,571.32, 3,548.42 and 1,392.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,571.32 : 3,548.42 = 1,392.40 : x
2. Step 2: Convert to fraction form
   2,571.32/3,548.42 = 1,392.40/x
3. Step 3: Cross multiply
   2,571.32x = 3,548.42 × 1,392.40
4. Step 4: Simplify right side
   2,571.32x = 4,940,820.01
5. Step 5: Solve for x
   x = 4,940,820.01/2,571.32
6. Step 6: Final answer
   x = 1,921.51