Finding the Fourth Proportional to 1,636.15, 2,258.04 and 1,007.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,636.15 : 2,258.04 = 1,007.09 : x
2. Step 2: Convert to fraction form
   1,636.15/2,258.04 = 1,007.09/x
3. Step 3: Cross multiply
   1,636.15x = 2,258.04 × 1,007.09
4. Step 4: Simplify right side
   1,636.15x = 2,274,049.50
5. Step 5: Solve for x
   x = 2,274,049.50/1,636.15
6. Step 6: Final answer
   x = 1,389.88