Finding the Fourth Proportional to 1,436.53, 1,982.42 and 815.53

Step by Step Solution

1. Step 1: Write the proportion equation
   1,436.53 : 1,982.42 = 815.53 : x
2. Step 2: Convert to fraction form
   1,436.53/1,982.42 = 815.53/x
3. Step 3: Cross multiply
   1,436.53x = 1,982.42 × 815.53
4. Step 4: Simplify right side
   1,436.53x = 1,616,721.38
5. Step 5: Solve for x
   x = 1,616,721.38/1,436.53
6. Step 6: Final answer
   x = 1,125.43