Finding the Fourth Proportional to 1,488.48, 2,228.56 and 1,122.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.48 : 2,228.56 = 1,122.12 : x
2. Step 2: Convert to fraction form
   1,488.48/2,228.56 = 1,122.12/x
3. Step 3: Cross multiply
   1,488.48x = 2,228.56 × 1,122.12
4. Step 4: Simplify right side
   1,488.48x = 2,500,711.75
5. Step 5: Solve for x
   x = 2,500,711.75/1,488.48
6. Step 6: Final answer
   x = 1,680.04