Finding the Fourth Proportional to 2,659.07, 3,989.18 and 810.14

Step by Step Solution

1. Step 1: Write the proportion equation
   2,659.07 : 3,989.18 = 810.14 : x
2. Step 2: Convert to fraction form
   2,659.07/3,989.18 = 810.14/x
3. Step 3: Cross multiply
   2,659.07x = 3,989.18 × 810.14
4. Step 4: Simplify right side
   2,659.07x = 3,231,773.33
5. Step 5: Solve for x
   x = 3,231,773.33/2,659.07
6. Step 6: Final answer
   x = 1,215.38