Finding the Fourth Proportional to 1,636.47, 2,258.27 and 890.41

Step by Step Solution

1. Step 1: Write the proportion equation
   1,636.47 : 2,258.27 = 890.41 : x
2. Step 2: Convert to fraction form
   1,636.47/2,258.27 = 890.41/x
3. Step 3: Cross multiply
   1,636.47x = 2,258.27 × 890.41
4. Step 4: Simplify right side
   1,636.47x = 2,010,786.19
5. Step 5: Solve for x
   x = 2,010,786.19/1,636.47
6. Step 6: Final answer
   x = 1,228.73