Finding the Fourth Proportional to 1,636.55, 2,258.43 and 890.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,636.55 : 2,258.43 = 890.49 : x
2. Step 2: Convert to fraction form
   1,636.55/2,258.43 = 890.49/x
3. Step 3: Cross multiply
   1,636.55x = 2,258.43 × 890.49
4. Step 4: Simplify right side
   1,636.55x = 2,011,109.33
5. Step 5: Solve for x
   x = 2,011,109.33/1,636.55
6. Step 6: Final answer
   x = 1,228.87