Finding the Fourth Proportional to 5,319.48, 7,980.42 and 2,856.72

Step by Step Solution

1. Step 1: Write the proportion equation
   5,319.48 : 7,980.42 = 2,856.72 : x
2. Step 2: Convert to fraction form
   5,319.48/7,980.42 = 2,856.72/x
3. Step 3: Cross multiply
   5,319.48x = 7,980.42 × 2,856.72
4. Step 4: Simplify right side
   5,319.48x = 22,797,825.42
5. Step 5: Solve for x
   x = 22,797,825.42/5,319.48
6. Step 6: Final answer
   x = 4,285.72