Finding the Fourth Proportional to 1,636.71, 2,258.23 and 928.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,636.71 : 2,258.23 = 928.56 : x
2. Step 2: Convert to fraction form
   1,636.71/2,258.23 = 928.56/x
3. Step 3: Cross multiply
   1,636.71x = 2,258.23 × 928.56
4. Step 4: Simplify right side
   1,636.71x = 2,096,902.05
5. Step 5: Solve for x
   x = 2,096,902.05/1,636.71
6. Step 6: Final answer
   x = 1,281.17