Finding the Fourth Proportional to 2,150.40, 2,967.60 and 1,311.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,150.40 : 2,967.60 = 1,311.12 : x
2. Step 2: Convert to fraction form
   2,150.40/2,967.60 = 1,311.12/x
3. Step 3: Cross multiply
   2,150.40x = 2,967.60 × 1,311.12
4. Step 4: Simplify right side
   2,150.40x = 3,890,879.71
5. Step 5: Solve for x
   x = 3,890,879.71/2,150.40
6. Step 6: Final answer
   x = 1,809.37