Finding the Fourth Proportional to 2,459.48, 3,688.34 and 815.80

Step by Step Solution

1. Step 1: Write the proportion equation
   2,459.48 : 3,688.34 = 815.80 : x
2. Step 2: Convert to fraction form
   2,459.48/3,688.34 = 815.80/x
3. Step 3: Cross multiply
   2,459.48x = 3,688.34 × 815.80
4. Step 4: Simplify right side
   2,459.48x = 3,008,947.77
5. Step 5: Solve for x
   x = 3,008,947.77/2,459.48
6. Step 6: Final answer
   x = 1,223.41