Finding the Fourth Proportional to 1,798.37, 2,698.59 and 810.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,798.37 : 2,698.59 = 810.89 : x
2. Step 2: Convert to fraction form
   1,798.37/2,698.59 = 810.89/x
3. Step 3: Cross multiply
   1,798.37x = 2,698.59 × 810.89
4. Step 4: Simplify right side
   1,798.37x = 2,188,259.65
5. Step 5: Solve for x
   x = 2,188,259.65/1,798.37
6. Step 6: Final answer
   x = 1,216.80