Finding the Fourth Proportional to 2,459.57, 3,688.55 and 815.67

Step by Step Solution

1. Step 1: Write the proportion equation
   2,459.57 : 3,688.55 = 815.67 : x
2. Step 2: Convert to fraction form
   2,459.57/3,688.55 = 815.67/x
3. Step 3: Cross multiply
   2,459.57x = 3,688.55 × 815.67
4. Step 4: Simplify right side
   2,459.57x = 3,008,647.00
5. Step 5: Solve for x
   x = 3,008,647.00/2,459.57
6. Step 6: Final answer
   x = 1,223.24