Finding the Fourth Proportional to 3,942.69, 5,913.59 and 1,309.56

Step by Step Solution

1. Step 1: Write the proportion equation
   3,942.69 : 5,913.59 = 1,309.56 : x
2. Step 2: Convert to fraction form
   3,942.69/5,913.59 = 1,309.56/x
3. Step 3: Cross multiply
   3,942.69x = 5,913.59 × 1,309.56
4. Step 4: Simplify right side
   3,942.69x = 7,744,194.37
5. Step 5: Solve for x
   x = 7,744,194.37/3,942.69
6. Step 6: Final answer
   x = 1,964.19