Finding the Fourth Proportional to 2,458.75, 3,686.87 and 814.71

Step by Step Solution

1. Step 1: Write the proportion equation
   2,458.75 : 3,686.87 = 814.71 : x
2. Step 2: Convert to fraction form
   2,458.75/3,686.87 = 814.71/x
3. Step 3: Cross multiply
   2,458.75x = 3,686.87 × 814.71
4. Step 4: Simplify right side
   2,458.75x = 3,003,729.86
5. Step 5: Solve for x
   x = 3,003,729.86/2,458.75
6. Step 6: Final answer
   x = 1,221.65