Finding the Fourth Proportional to 1,644.57, 2,269.31 and 1,086.21

Step by Step Solution

1. Step 1: Write the proportion equation
   1,644.57 : 2,269.31 = 1,086.21 : x
2. Step 2: Convert to fraction form
   1,644.57/2,269.31 = 1,086.21/x
3. Step 3: Cross multiply
   1,644.57x = 2,269.31 × 1,086.21
4. Step 4: Simplify right side
   1,644.57x = 2,464,941.78
5. Step 5: Solve for x
   x = 2,464,941.78/1,644.57
6. Step 6: Final answer
   x = 1,498.84