Finding the Fourth Proportional to 3,907.42, 5,859.72 and 1,309.76

Step by Step Solution

1. Step 1: Write the proportion equation
   3,907.42 : 5,859.72 = 1,309.76 : x
2. Step 2: Convert to fraction form
   3,907.42/5,859.72 = 1,309.76/x
3. Step 3: Cross multiply
   3,907.42x = 5,859.72 × 1,309.76
4. Step 4: Simplify right side
   3,907.42x = 7,674,826.87
5. Step 5: Solve for x
   x = 7,674,826.87/3,907.42
6. Step 6: Final answer
   x = 1,964.17