Finding the Fourth Proportional to 1,488.16, 2,229.81 and 1,431.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,488.16 : 2,229.81 = 1,431.28 : x
2. Step 2: Convert to fraction form
   1,488.16/2,229.81 = 1,431.28/x
3. Step 3: Cross multiply
   1,488.16x = 2,229.81 × 1,431.28
4. Step 4: Simplify right side
   1,488.16x = 3,191,482.46
5. Step 5: Solve for x
   x = 3,191,482.46/1,488.16
6. Step 6: Final answer
   x = 2,144.58