Finding the Fourth Proportional to 2,565.73, 3,848.74 and 810.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,565.73 : 3,848.74 = 810.79 : x
2. Step 2: Convert to fraction form
   2,565.73/3,848.74 = 810.79/x
3. Step 3: Cross multiply
   2,565.73x = 3,848.74 × 810.79
4. Step 4: Simplify right side
   2,565.73x = 3,120,500.66
5. Step 5: Solve for x
   x = 3,120,500.66/2,565.73
6. Step 6: Final answer
   x = 1,216.23