Finding the Fourth Proportional to 1,839.71, 2,760.78 and 865.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,839.71 : 2,760.78 = 865.89 : x
2. Step 2: Convert to fraction form
   1,839.71/2,760.78 = 865.89/x
3. Step 3: Cross multiply
   1,839.71x = 2,760.78 × 865.89
4. Step 4: Simplify right side
   1,839.71x = 2,390,515.83
5. Step 5: Solve for x
   x = 2,390,515.83/1,839.71
6. Step 6: Final answer
   x = 1,299.40