Finding the Fourth Proportional to 1,308.20, 1,805.61 and 889.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,308.20 : 1,805.61 = 889.25 : x
2. Step 2: Convert to fraction form
   1,308.20/1,805.61 = 889.25/x
3. Step 3: Cross multiply
   1,308.20x = 1,805.61 × 889.25
4. Step 4: Simplify right side
   1,308.20x = 1,605,629.66
5. Step 5: Solve for x
   x = 1,605,629.66/1,308.20
6. Step 6: Final answer
   x = 1,227.36