Finding the Fourth Proportional to 3,984.50, 5,978.46 and 2,135.09

Step by Step Solution

1. Step 1: Write the proportion equation
   3,984.50 : 5,978.46 = 2,135.09 : x
2. Step 2: Convert to fraction form
   3,984.50/5,978.46 = 2,135.09/x
3. Step 3: Cross multiply
   3,984.50x = 5,978.46 × 2,135.09
4. Step 4: Simplify right side
   3,984.50x = 12,764,550.16
5. Step 5: Solve for x
   x = 12,764,550.16/3,984.50
6. Step 6: Final answer
   x = 3,203.55