Finding the Fourth Proportional to 2,890.29, 4,335.25 and 810.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,890.29 : 4,335.25 = 810.25 : x
2. Step 2: Convert to fraction form
   2,890.29/4,335.25 = 810.25/x
3. Step 3: Cross multiply
   2,890.29x = 4,335.25 × 810.25
4. Step 4: Simplify right side
   2,890.29x = 3,512,610.59
5. Step 5: Solve for x
   x = 3,512,610.59/2,890.29
6. Step 6: Final answer
   x = 1,215.32