Finding the Fourth Proportional to 2,453.88, 3,680.31 and 810.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,453.88 : 3,680.31 = 810.05 : x
2. Step 2: Convert to fraction form
   2,453.88/3,680.31 = 810.05/x
3. Step 3: Cross multiply
   2,453.88x = 3,680.31 × 810.05
4. Step 4: Simplify right side
   2,453.88x = 2,981,235.12
5. Step 5: Solve for x
   x = 2,981,235.12/2,453.88
6. Step 6: Final answer
   x = 1,214.91