Finding the Fourth Proportional to 1,947.71, 2,919.51 and 1,399.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,947.71 : 2,919.51 = 1,399.61 : x
2. Step 2: Convert to fraction form
   1,947.71/2,919.51 = 1,399.61/x
3. Step 3: Cross multiply
   1,947.71x = 2,919.51 × 1,399.61
4. Step 4: Simplify right side
   1,947.71x = 4,086,182.69
5. Step 5: Solve for x
   x = 4,086,182.69/1,947.71
6. Step 6: Final answer
   x = 2,097.94