Finding the Fourth Proportional to 1,863.60, 2,789.92 and 1,306.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,863.60 : 2,789.92 = 1,306.37 : x
2. Step 2: Convert to fraction form
   1,863.60/2,789.92 = 1,306.37/x
3. Step 3: Cross multiply
   1,863.60x = 2,789.92 × 1,306.37
4. Step 4: Simplify right side
   1,863.60x = 3,644,667.79
5. Step 5: Solve for x
   x = 3,644,667.79/1,863.60
6. Step 6: Final answer
   x = 1,955.71