Finding the Fourth Proportional to 2,453.40, 3,680.61 and 810.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,453.40 : 3,680.61 = 810.10 : x
2. Step 2: Convert to fraction form
   2,453.40/3,680.61 = 810.10/x
3. Step 3: Cross multiply
   2,453.40x = 3,680.61 × 810.10
4. Step 4: Simplify right side
   2,453.40x = 2,981,662.16
5. Step 5: Solve for x
   x = 2,981,662.16/2,453.40
6. Step 6: Final answer
   x = 1,215.32