Finding the Fourth Proportional to 2,080.29, 2,870.69 and 1,218.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,080.29 : 2,870.69 = 1,218.20 : x
2. Step 2: Convert to fraction form
   2,080.29/2,870.69 = 1,218.20/x
3. Step 3: Cross multiply
   2,080.29x = 2,870.69 × 1,218.20
4. Step 4: Simplify right side
   2,080.29x = 3,497,077.11
5. Step 5: Solve for x
   x = 3,497,077.11/2,080.29
6. Step 6: Final answer
   x = 1,681.05