Finding the Fourth Proportional to 2,620.37, 3,931.04 and 865.49

Step by Step Solution

1. Step 1: Write the proportion equation
   2,620.37 : 3,931.04 = 865.49 : x
2. Step 2: Convert to fraction form
   2,620.37/3,931.04 = 865.49/x
3. Step 3: Cross multiply
   2,620.37x = 3,931.04 × 865.49
4. Step 4: Simplify right side
   2,620.37x = 3,402,293.55
5. Step 5: Solve for x
   x = 3,402,293.55/2,620.37
6. Step 6: Final answer
   x = 1,298.40