Finding the Fourth Proportional to 2,456.65, 3,685.25 and 812.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,456.65 : 3,685.25 = 812.60 : x
2. Step 2: Convert to fraction form
   2,456.65/3,685.25 = 812.60/x
3. Step 3: Cross multiply
   2,456.65x = 3,685.25 × 812.60
4. Step 4: Simplify right side
   2,456.65x = 2,994,620.87
5. Step 5: Solve for x
   x = 2,994,620.87/2,456.65
6. Step 6: Final answer
   x = 1,218.99