Finding the Fourth Proportional to 2,459.88, 3,687.38 and 815.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,459.88 : 3,687.38 = 815.30 : x
2. Step 2: Convert to fraction form
   2,459.88/3,687.38 = 815.30/x
3. Step 3: Cross multiply
   2,459.88x = 3,687.38 × 815.30
4. Step 4: Simplify right side
   2,459.88x = 3,006,320.91
5. Step 5: Solve for x
   x = 3,006,320.91/2,459.88
6. Step 6: Final answer
   x = 1,222.14