Finding the Fourth Proportional to 1,856.31, 2,561.71 and 1,028.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,856.31 : 2,561.71 = 1,028.31 : x
2. Step 2: Convert to fraction form
   1,856.31/2,561.71 = 1,028.31/x
3. Step 3: Cross multiply
   1,856.31x = 2,561.71 × 1,028.31
4. Step 4: Simplify right side
   1,856.31x = 2,634,232.01
5. Step 5: Solve for x
   x = 2,634,232.01/1,856.31
6. Step 6: Final answer
   x = 1,419.07