Finding the Fourth Proportional to 2,459.39, 3,687.87 and 815.38

Step by Step Solution

1. Step 1: Write the proportion equation
   2,459.39 : 3,687.87 = 815.38 : x
2. Step 2: Convert to fraction form
   2,459.39/3,687.87 = 815.38/x
3. Step 3: Cross multiply
   2,459.39x = 3,687.87 × 815.38
4. Step 4: Simplify right side
   2,459.39x = 3,007,008.73
5. Step 5: Solve for x
   x = 3,007,008.73/2,459.39
6. Step 6: Final answer
   x = 1,222.67