Finding the Fourth Proportional to 2,856.37, 4,283.47 and 1,213.69

Step by Step Solution

1. Step 1: Write the proportion equation
   2,856.37 : 4,283.47 = 1,213.69 : x
2. Step 2: Convert to fraction form
   2,856.37/4,283.47 = 1,213.69/x
3. Step 3: Cross multiply
   2,856.37x = 4,283.47 × 1,213.69
4. Step 4: Simplify right side
   2,856.37x = 5,198,804.70
5. Step 5: Solve for x
   x = 5,198,804.70/2,856.37
6. Step 6: Final answer
   x = 1,820.07