Finding the Fourth Proportional to 1,443.66, 2,155.75 and 1,428.40

Step by Step Solution

1. Step 1: Write the proportion equation
   1,443.66 : 2,155.75 = 1,428.40 : x
2. Step 2: Convert to fraction form
   1,443.66/2,155.75 = 1,428.40/x
3. Step 3: Cross multiply
   1,443.66x = 2,155.75 × 1,428.40
4. Step 4: Simplify right side
   1,443.66x = 3,079,271.07
5. Step 5: Solve for x
   x = 3,079,271.07/1,443.66
6. Step 6: Final answer
   x = 2,132.96