Finding the Fourth Proportional to 1,208.94, 1,806.50 and 860.37

Step by Step Solution

1. Step 1: Write the proportion equation
   1,208.94 : 1,806.50 = 860.37 : x
2. Step 2: Convert to fraction form
   1,208.94/1,806.50 = 860.37/x
3. Step 3: Cross multiply
   1,208.94x = 1,806.50 × 860.37
4. Step 4: Simplify right side
   1,208.94x = 1,554,254.10
5. Step 5: Solve for x
   x = 1,554,254.10/1,208.94
6. Step 6: Final answer
   x = 1,285.63