Finding the Fourth Proportional to 2,108.98, 3,162.98 and 810.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,108.98 : 3,162.98 = 810.16 : x
2. Step 2: Convert to fraction form
   2,108.98/3,162.98 = 810.16/x
3. Step 3: Cross multiply
   2,108.98x = 3,162.98 × 810.16
4. Step 4: Simplify right side
   2,108.98x = 2,562,519.88
5. Step 5: Solve for x
   x = 2,562,519.88/2,108.98
6. Step 6: Final answer
   x = 1,215.05