Finding the Fourth Proportional to 2,459.45, 3,689.55 and 815.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,459.45 : 3,689.55 = 815.63 : x
2. Step 2: Convert to fraction form
   2,459.45/3,689.55 = 815.63/x
3. Step 3: Cross multiply
   2,459.45x = 3,689.55 × 815.63
4. Step 4: Simplify right side
   2,459.45x = 3,009,289.22
5. Step 5: Solve for x
   x = 3,009,289.22/2,459.45
6. Step 6: Final answer
   x = 1,223.56