Finding the Fourth Proportional to 1,644.15, 2,268.56 and 980.88

Step by Step Solution

1. Step 1: Write the proportion equation
   1,644.15 : 2,268.56 = 980.88 : x
2. Step 2: Convert to fraction form
   1,644.15/2,268.56 = 980.88/x
3. Step 3: Cross multiply
   1,644.15x = 2,268.56 × 980.88
4. Step 4: Simplify right side
   1,644.15x = 2,225,171.34
5. Step 5: Solve for x
   x = 2,225,171.34/1,644.15
6. Step 6: Final answer
   x = 1,353.39