Finding the Fourth Proportional to 2,661.58, 3,993.04 and 812.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,661.58 : 3,993.04 = 812.62 : x
2. Step 2: Convert to fraction form
   2,661.58/3,993.04 = 812.62/x
3. Step 3: Cross multiply
   2,661.58x = 3,993.04 × 812.62
4. Step 4: Simplify right side
   2,661.58x = 3,244,815.20
5. Step 5: Solve for x
   x = 3,244,815.20/2,661.58
6. Step 6: Final answer
   x = 1,219.13