Finding the Fourth Proportional to 1,609.29, 2,220.89 and 910.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,609.29 : 2,220.89 = 910.71 : x
2. Step 2: Convert to fraction form
   1,609.29/2,220.89 = 910.71/x
3. Step 3: Cross multiply
   1,609.29x = 2,220.89 × 910.71
4. Step 4: Simplify right side
   1,609.29x = 2,022,582.18
5. Step 5: Solve for x
   x = 2,022,582.18/1,609.29
6. Step 6: Final answer
   x = 1,256.82