Finding the Fourth Proportional to 5,578.92, 7,697.36 and 3,986.05

Step by Step Solution

1. Step 1: Write the proportion equation
   5,578.92 : 7,697.36 = 3,986.05 : x
2. Step 2: Convert to fraction form
   5,578.92/7,697.36 = 3,986.05/x
3. Step 3: Cross multiply
   5,578.92x = 7,697.36 × 3,986.05
4. Step 4: Simplify right side
   5,578.92x = 30,682,061.83
5. Step 5: Solve for x
   x = 30,682,061.83/5,578.92
6. Step 6: Final answer
   x = 5,499.64