Finding the Fourth Proportional to 1,636.14, 2,257.89 and 890.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,636.14 : 2,257.89 = 890.10 : x
2. Step 2: Convert to fraction form
   1,636.14/2,257.89 = 890.10/x
3. Step 3: Cross multiply
   1,636.14x = 2,257.89 × 890.10
4. Step 4: Simplify right side
   1,636.14x = 2,009,747.89
5. Step 5: Solve for x
   x = 2,009,747.89/1,636.14
6. Step 6: Final answer
   x = 1,228.35