Finding the Fourth Proportional to 3,399.11, 5,100.72 and 1,319.34

Step by Step Solution

1. Step 1: Write the proportion equation
   3,399.11 : 5,100.72 = 1,319.34 : x
2. Step 2: Convert to fraction form
   3,399.11/5,100.72 = 1,319.34/x
3. Step 3: Cross multiply
   3,399.11x = 5,100.72 × 1,319.34
4. Step 4: Simplify right side
   3,399.11x = 6,729,576.83
5. Step 5: Solve for x
   x = 6,729,576.83/3,399.11
6. Step 6: Final answer
   x = 1,979.80