Finding the Fourth Proportional to 2,580.66, 3,870.69 and 849.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,580.66 : 3,870.69 = 849.30 : x
2. Step 2: Convert to fraction form
   2,580.66/3,870.69 = 849.30/x
3. Step 3: Cross multiply
   2,580.66x = 3,870.69 × 849.30
4. Step 4: Simplify right side
   2,580.66x = 3,287,377.02
5. Step 5: Solve for x
   x = 3,287,377.02/2,580.66
6. Step 6: Final answer
   x = 1,273.85