Finding the Fourth Proportional to 3,978.53, 5,965.75 and 2,105.43

Step by Step Solution

1. Step 1: Write the proportion equation
   3,978.53 : 5,965.75 = 2,105.43 : x
2. Step 2: Convert to fraction form
   3,978.53/5,965.75 = 2,105.43/x
3. Step 3: Cross multiply
   3,978.53x = 5,965.75 × 2,105.43
4. Step 4: Simplify right side
   3,978.53x = 12,560,469.02
5. Step 5: Solve for x
   x = 12,560,469.02/3,978.53
6. Step 6: Final answer
   x = 3,157.06