Finding the Fourth Proportional to 1,636.06, 2,257.75 and 890.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,636.06 : 2,257.75 = 890.05 : x
2. Step 2: Convert to fraction form
   1,636.06/2,257.75 = 890.05/x
3. Step 3: Cross multiply
   1,636.06x = 2,257.75 × 890.05
4. Step 4: Simplify right side
   1,636.06x = 2,009,502.52
5. Step 5: Solve for x
   x = 2,009,502.52/1,636.06
6. Step 6: Final answer
   x = 1,228.26