Finding the Fourth Proportional to 1,488.54, 2,053.20 and 890.64

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.54 : 2,053.20 = 890.64 : x
2. Step 2: Convert to fraction form
   1,488.54/2,053.20 = 890.64/x
3. Step 3: Cross multiply
   1,488.54x = 2,053.20 × 890.64
4. Step 4: Simplify right side
   1,488.54x = 1,828,662.05
5. Step 5: Solve for x
   x = 1,828,662.05/1,488.54
6. Step 6: Final answer
   x = 1,228.49