Finding the Fourth Proportional to 1,644.57, 2,269.62 and 981.72

Step by Step Solution

1. Step 1: Write the proportion equation
   1,644.57 : 2,269.62 = 981.72 : x
2. Step 2: Convert to fraction form
   1,644.57/2,269.62 = 981.72/x
3. Step 3: Cross multiply
   1,644.57x = 2,269.62 × 981.72
4. Step 4: Simplify right side
   1,644.57x = 2,228,131.35
5. Step 5: Solve for x
   x = 2,228,131.35/1,644.57
6. Step 6: Final answer
   x = 1,354.84