Finding the Fourth Proportional to 2,454.86, 3,679.88 and 810.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,454.86 : 3,679.88 = 810.30 : x
2. Step 2: Convert to fraction form
   2,454.86/3,679.88 = 810.30/x
3. Step 3: Cross multiply
   2,454.86x = 3,679.88 × 810.30
4. Step 4: Simplify right side
   2,454.86x = 2,981,821.07
5. Step 5: Solve for x
   x = 2,981,821.07/2,454.86
6. Step 6: Final answer
   x = 1,214.66