Finding the Fourth Proportional to 5,643.73, 7,780.22 and 3,959.92

Step by Step Solution

1. Step 1: Write the proportion equation
   5,643.73 : 7,780.22 = 3,959.92 : x
2. Step 2: Convert to fraction form
   5,643.73/7,780.22 = 3,959.92/x
3. Step 3: Cross multiply
   5,643.73x = 7,780.22 × 3,959.92
4. Step 4: Simplify right side
   5,643.73x = 30,809,048.78
5. Step 5: Solve for x
   x = 30,809,048.78/5,643.73
6. Step 6: Final answer
   x = 5,458.99