Finding the Fourth Proportional to 1,636.86, 2,258.88 and 890.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,636.86 : 2,258.88 = 890.82 : x
2. Step 2: Convert to fraction form
   1,636.86/2,258.88 = 890.82/x
3. Step 3: Cross multiply
   1,636.86x = 2,258.88 × 890.82
4. Step 4: Simplify right side
   1,636.86x = 2,012,255.48
5. Step 5: Solve for x
   x = 2,012,255.48/1,636.86
6. Step 6: Final answer
   x = 1,229.34