Finding the Fourth Proportional to 2,580.34, 3,870.78 and 849.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,580.34 : 3,870.78 = 849.28 : x
2. Step 2: Convert to fraction form
   2,580.34/3,870.78 = 849.28/x
3. Step 3: Cross multiply
   2,580.34x = 3,870.78 × 849.28
4. Step 4: Simplify right side
   2,580.34x = 3,287,376.04
5. Step 5: Solve for x
   x = 3,287,376.04/2,580.34
6. Step 6: Final answer
   x = 1,274.01