Finding the Fourth Proportional to 1,436.61, 1,982.43 and 815.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,436.61 : 1,982.43 = 815.61 : x
2. Step 2: Convert to fraction form
   1,436.61/1,982.43 = 815.61/x
3. Step 3: Cross multiply
   1,436.61x = 1,982.43 × 815.61
4. Step 4: Simplify right side
   1,436.61x = 1,616,889.73
5. Step 5: Solve for x
   x = 1,616,889.73/1,436.61
6. Step 6: Final answer
   x = 1,125.49