Finding the Fourth Proportional to 2,856.07, 4,280.56 and 1,210.75

Step by Step Solution

1. Step 1: Write the proportion equation
   2,856.07 : 4,280.56 = 1,210.75 : x
2. Step 2: Convert to fraction form
   2,856.07/4,280.56 = 1,210.75/x
3. Step 3: Cross multiply
   2,856.07x = 4,280.56 × 1,210.75
4. Step 4: Simplify right side
   2,856.07x = 5,182,688.02
5. Step 5: Solve for x
   x = 5,182,688.02/2,856.07
6. Step 6: Final answer
   x = 1,814.62