Finding the Fourth Proportional to 2,453.55, 3,680.23 and 810.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,453.55 : 3,680.23 = 810.05 : x
2. Step 2: Convert to fraction form
   2,453.55/3,680.23 = 810.05/x
3. Step 3: Cross multiply
   2,453.55x = 3,680.23 × 810.05
4. Step 4: Simplify right side
   2,453.55x = 2,981,170.31
5. Step 5: Solve for x
   x = 2,981,170.31/2,453.55
6. Step 6: Final answer
   x = 1,215.04