Finding the Fourth Proportional to 1,636.34, 2,258.16 and 890.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,636.34 : 2,258.16 = 890.31 : x
2. Step 2: Convert to fraction form
   1,636.34/2,258.16 = 890.31/x
3. Step 3: Cross multiply
   1,636.34x = 2,258.16 × 890.31
4. Step 4: Simplify right side
   1,636.34x = 2,010,462.43
5. Step 5: Solve for x
   x = 2,010,462.43/1,636.34
6. Step 6: Final answer
   x = 1,228.64