Finding the Fourth Proportional to 1,643.78, 2,268.32 and 897.59

Step by Step Solution

1. Step 1: Write the proportion equation
   1,643.78 : 2,268.32 = 897.59 : x
2. Step 2: Convert to fraction form
   1,643.78/2,268.32 = 897.59/x
3. Step 3: Cross multiply
   1,643.78x = 2,268.32 × 897.59
4. Step 4: Simplify right side
   1,643.78x = 2,036,005.52
5. Step 5: Solve for x
   x = 2,036,005.52/1,643.78
6. Step 6: Final answer
   x = 1,238.62