Finding the Fourth Proportional to 1,644.69, 2,467.72 and 864.51

Step by Step Solution

1. Step 1: Write the proportion equation
   1,644.69 : 2,467.72 = 864.51 : x
2. Step 2: Convert to fraction form
   1,644.69/2,467.72 = 864.51/x
3. Step 3: Cross multiply
   1,644.69x = 2,467.72 × 864.51
4. Step 4: Simplify right side
   1,644.69x = 2,133,359.75
5. Step 5: Solve for x
   x = 2,133,359.75/1,644.69
6. Step 6: Final answer
   x = 1,297.12