Finding the Fourth Proportional to 2,691, 3,713.24 and 1,571.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,691 : 3,713.24 = 1,571.72 : x
2. Step 2: Convert to fraction form
   2,691/3,713.24 = 1,571.72/x
3. Step 3: Cross multiply
   2,691x = 3,713.24 × 1,571.72
4. Step 4: Simplify right side
   2,691x = 5,836,173.57
5. Step 5: Solve for x
   x = 5,836,173.57/2,691
6. Step 6: Final answer
   x = 2,168.78