Finding the Fourth Proportional to 1,436.81, 1,982.81 and 815.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,436.81 : 1,982.81 = 815.81 : x
2. Step 2: Convert to fraction form
   1,436.81/1,982.81 = 815.81/x
3. Step 3: Cross multiply
   1,436.81x = 1,982.81 × 815.81
4. Step 4: Simplify right side
   1,436.81x = 1,617,597.10
5. Step 5: Solve for x
   x = 1,617,597.10/1,436.81
6. Step 6: Final answer
   x = 1,125.82