Finding the Fourth Proportional to 1,636.50, 2,258.31 and 890.46

Step by Step Solution

1. Step 1: Write the proportion equation
   1,636.50 : 2,258.31 = 890.46 : x
2. Step 2: Convert to fraction form
   1,636.50/2,258.31 = 890.46/x
3. Step 3: Cross multiply
   1,636.50x = 2,258.31 × 890.46
4. Step 4: Simplify right side
   1,636.50x = 2,010,934.72
5. Step 5: Solve for x
   x = 2,010,934.72/1,636.50
6. Step 6: Final answer
   x = 1,228.80