Finding the Fourth Proportional to 2,458.48, 3,687.34 and 815.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,458.48 : 3,687.34 = 815.05 : x
2. Step 2: Convert to fraction form
   2,458.48/3,687.34 = 815.05/x
3. Step 3: Cross multiply
   2,458.48x = 3,687.34 × 815.05
4. Step 4: Simplify right side
   2,458.48x = 3,005,366.47
5. Step 5: Solve for x
   x = 3,005,366.47/2,458.48
6. Step 6: Final answer
   x = 1,222.45