Finding the Fourth Proportional to 2,216.24, 3,059.40 and 1,420.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.24 : 3,059.40 = 1,420.40 : x
2. Step 2: Convert to fraction form
   2,216.24/3,059.40 = 1,420.40/x
3. Step 3: Cross multiply
   2,216.24x = 3,059.40 × 1,420.40
4. Step 4: Simplify right side
   2,216.24x = 4,345,571.76
5. Step 5: Solve for x
   x = 4,345,571.76/2,216.24
6. Step 6: Final answer
   x = 1,960.79