Finding the Fourth Proportional to 1,433.71, 1,986.19 and 1,399.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,433.71 : 1,986.19 = 1,399.69 : x
2. Step 2: Convert to fraction form
   1,433.71/1,986.19 = 1,399.69/x
3. Step 3: Cross multiply
   1,433.71x = 1,986.19 × 1,399.69
4. Step 4: Simplify right side
   1,433.71x = 2,780,050.28
5. Step 5: Solve for x
   x = 2,780,050.28/1,433.71
6. Step 6: Final answer
   x = 1,939.06