Finding the Fourth Proportional to 2,620.24, 3,931.00 and 865.35

Step by Step Solution

1. Step 1: Write the proportion equation
   2,620.24 : 3,931.00 = 865.35 : x
2. Step 2: Convert to fraction form
   2,620.24/3,931.00 = 865.35/x
3. Step 3: Cross multiply
   2,620.24x = 3,931.00 × 865.35
4. Step 4: Simplify right side
   2,620.24x = 3,401,688.69
5. Step 5: Solve for x
   x = 3,401,688.69/2,620.24
6. Step 6: Final answer
   x = 1,298.24