Finding the Fourth Proportional to 2,289.50, 3,159.52 and 1,405.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,289.50 : 3,159.52 = 1,405.28 : x
2. Step 2: Convert to fraction form
   2,289.50/3,159.52 = 1,405.28/x
3. Step 3: Cross multiply
   2,289.50x = 3,159.52 × 1,405.28
4. Step 4: Simplify right side
   2,289.50x = 4,440,010.27
5. Step 5: Solve for x
   x = 4,440,010.27/2,289.50
6. Step 6: Final answer
   x = 1,939.29