Finding the Fourth Proportional to 1,643.69, 2,268.25 and 897.65

Step by Step Solution

1. Step 1: Write the proportion equation
   1,643.69 : 2,268.25 = 897.65 : x
2. Step 2: Convert to fraction form
   1,643.69/2,268.25 = 897.65/x
3. Step 3: Cross multiply
   1,643.69x = 2,268.25 × 897.65
4. Step 4: Simplify right side
   1,643.69x = 2,036,098.04
5. Step 5: Solve for x
   x = 2,036,098.04/1,643.69
6. Step 6: Final answer
   x = 1,238.74