Finding the Fourth Proportional to 2,289.50, 3,159.38 and 1,405.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,289.50 : 3,159.38 = 1,405.12 : x
2. Step 2: Convert to fraction form
   2,289.50/3,159.38 = 1,405.12/x
3. Step 3: Cross multiply
   2,289.50x = 3,159.38 × 1,405.12
4. Step 4: Simplify right side
   2,289.50x = 4,439,308.03
5. Step 5: Solve for x
   x = 4,439,308.03/2,289.50
6. Step 6: Final answer
   x = 1,938.99