Finding the Fourth Proportional to 1,436.82, 2,155.77 and 860.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,436.82 : 2,155.77 = 860.10 : x
2. Step 2: Convert to fraction form
   1,436.82/2,155.77 = 860.10/x
3. Step 3: Cross multiply
   1,436.82x = 2,155.77 × 860.10
4. Step 4: Simplify right side
   1,436.82x = 1,854,177.78
5. Step 5: Solve for x
   x = 1,854,177.78/1,436.82
6. Step 6: Final answer
   x = 1,290.47