Finding the Fourth Proportional to 1,636.74, 2,258.69 and 890.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,636.74 : 2,258.69 = 890.69 : x
2. Step 2: Convert to fraction form
   1,636.74/2,258.69 = 890.69/x
3. Step 3: Cross multiply
   1,636.74x = 2,258.69 × 890.69
4. Step 4: Simplify right side
   1,636.74x = 2,011,776.85
5. Step 5: Solve for x
   x = 2,011,776.85/1,636.74
6. Step 6: Final answer
   x = 1,229.14