Finding the Fourth Proportional to 2,659.73, 3,989.33 and 810.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,659.73 : 3,989.33 = 810.86 : x
2. Step 2: Convert to fraction form
   2,659.73/3,989.33 = 810.86/x
3. Step 3: Cross multiply
   2,659.73x = 3,989.33 × 810.86
4. Step 4: Simplify right side
   2,659.73x = 3,234,764.12
5. Step 5: Solve for x
   x = 3,234,764.12/2,659.73
6. Step 6: Final answer
   x = 1,216.20