Finding the Fourth Proportional to 2,890.02, 4,334.69 and 810.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,890.02 : 4,334.69 = 810.18 : x
2. Step 2: Convert to fraction form
   2,890.02/4,334.69 = 810.18/x
3. Step 3: Cross multiply
   2,890.02x = 4,334.69 × 810.18
4. Step 4: Simplify right side
   2,890.02x = 3,511,881.17
5. Step 5: Solve for x
   x = 3,511,881.17/2,890.02
6. Step 6: Final answer
   x = 1,215.17