Finding the Fourth Proportional to 2,002.40, 2,763.24 and 1,216.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,002.40 : 2,763.24 = 1,216.28 : x
2. Step 2: Convert to fraction form
   2,002.40/2,763.24 = 1,216.28/x
3. Step 3: Cross multiply
   2,002.40x = 2,763.24 × 1,216.28
4. Step 4: Simplify right side
   2,002.40x = 3,360,873.55
5. Step 5: Solve for x
   x = 3,360,873.55/2,002.40
6. Step 6: Final answer
   x = 1,678.42