Finding the Fourth Proportional to 3,899.12, 5,839.89 and 2,734.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,899.12 : 5,839.89 = 2,734.31 : x
2. Step 2: Convert to fraction form
   3,899.12/5,839.89 = 2,734.31/x
3. Step 3: Cross multiply
   3,899.12x = 5,839.89 × 2,734.31
4. Step 4: Simplify right side
   3,899.12x = 15,968,040.43
5. Step 5: Solve for x
   x = 15,968,040.43/3,899.12
6. Step 6: Final answer
   x = 4,095.30