Finding the Fourth Proportional to 1,436.22, 2,151.33 and 858.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,436.22 : 2,151.33 = 858.78 : x
2. Step 2: Convert to fraction form
   1,436.22/2,151.33 = 858.78/x
3. Step 3: Cross multiply
   1,436.22x = 2,151.33 × 858.78
4. Step 4: Simplify right side
   1,436.22x = 1,847,519.18
5. Step 5: Solve for x
   x = 1,847,519.18/1,436.22
6. Step 6: Final answer
   x = 1,286.38