Finding the Fourth Proportional to 2,620.41, 3,929.77 and 865.01

Step by Step Solution

1. Step 1: Write the proportion equation
   2,620.41 : 3,929.77 = 865.01 : x
2. Step 2: Convert to fraction form
   2,620.41/3,929.77 = 865.01/x
3. Step 3: Cross multiply
   2,620.41x = 3,929.77 × 865.01
4. Step 4: Simplify right side
   2,620.41x = 3,399,271.78
5. Step 5: Solve for x
   x = 3,399,271.78/2,620.41
6. Step 6: Final answer
   x = 1,297.23