Finding the Fourth Proportional to 2,043.18, 3,065.13 and 810.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,043.18 : 3,065.13 = 810.78 : x
2. Step 2: Convert to fraction form
   2,043.18/3,065.13 = 810.78/x
3. Step 3: Cross multiply
   2,043.18x = 3,065.13 × 810.78
4. Step 4: Simplify right side
   2,043.18x = 2,485,146.10
5. Step 5: Solve for x
   x = 2,485,146.10/2,043.18
6. Step 6: Final answer
   x = 1,216.31