Finding the Fourth Proportional to 1,436.49, 1,982.57 and 877.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,436.49 : 1,982.57 = 877.28 : x
2. Step 2: Convert to fraction form
   1,436.49/1,982.57 = 877.28/x
3. Step 3: Cross multiply
   1,436.49x = 1,982.57 × 877.28
4. Step 4: Simplify right side
   1,436.49x = 1,739,270.80
5. Step 5: Solve for x
   x = 1,739,270.80/1,436.49
6. Step 6: Final answer
   x = 1,210.78