Finding the Fourth Proportional to 2,215.12, 3,325.20 and 1,120.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,215.12 : 3,325.20 = 1,120.72 : x
2. Step 2: Convert to fraction form
   2,215.12/3,325.20 = 1,120.72/x
3. Step 3: Cross multiply
   2,215.12x = 3,325.20 × 1,120.72
4. Step 4: Simplify right side
   2,215.12x = 3,726,618.14
5. Step 5: Solve for x
   x = 3,726,618.14/2,215.12
6. Step 6: Final answer
   x = 1,682.35