Finding the Fourth Proportional to 3,969.07, 5,474.59 and 2,919.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,969.07 : 5,474.59 = 2,919.31 : x
2. Step 2: Convert to fraction form
   3,969.07/5,474.59 = 2,919.31/x
3. Step 3: Cross multiply
   3,969.07x = 5,474.59 × 2,919.31
4. Step 4: Simplify right side
   3,969.07x = 15,982,025.33
5. Step 5: Solve for x
   x = 15,982,025.33/3,969.07
6. Step 6: Final answer
   x = 4,026.64