Finding the Fourth Proportional to 1,636.62, 2,258.52 and 890.58

Step by Step Solution

1. Step 1: Write the proportion equation
   1,636.62 : 2,258.52 = 890.58 : x
2. Step 2: Convert to fraction form
   1,636.62/2,258.52 = 890.58/x
3. Step 3: Cross multiply
   1,636.62x = 2,258.52 × 890.58
4. Step 4: Simplify right side
   1,636.62x = 2,011,392.74
5. Step 5: Solve for x
   x = 2,011,392.74/1,636.62
6. Step 6: Final answer
   x = 1,228.99