Finding the Fourth Proportional to 3,571.12, 5,357.31 and 1,379.67

Step by Step Solution

1. Step 1: Write the proportion equation
   3,571.12 : 5,357.31 = 1,379.67 : x
2. Step 2: Convert to fraction form
   3,571.12/5,357.31 = 1,379.67/x
3. Step 3: Cross multiply
   3,571.12x = 5,357.31 × 1,379.67
4. Step 4: Simplify right side
   3,571.12x = 7,391,319.89
5. Step 5: Solve for x
   x = 7,391,319.89/3,571.12
6. Step 6: Final answer
   x = 2,069.75