Finding the Fourth Proportional to 2,659.44, 3,987.83 and 810.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,659.44 : 3,987.83 = 810.12 : x
2. Step 2: Convert to fraction form
   2,659.44/3,987.83 = 810.12/x
3. Step 3: Cross multiply
   2,659.44x = 3,987.83 × 810.12
4. Step 4: Simplify right side
   2,659.44x = 3,230,616.79
5. Step 5: Solve for x
   x = 3,230,616.79/2,659.44
6. Step 6: Final answer
   x = 1,214.77