Finding the Fourth Proportional to 1,636.32, 2,258.02 and 890.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,636.32 : 2,258.02 = 890.27 : x
2. Step 2: Convert to fraction form
   1,636.32/2,258.02 = 890.27/x
3. Step 3: Cross multiply
   1,636.32x = 2,258.02 × 890.27
4. Step 4: Simplify right side
   1,636.32x = 2,010,243.01
5. Step 5: Solve for x
   x = 2,010,243.01/1,636.32
6. Step 6: Final answer
   x = 1,228.51