Finding the Fourth Proportional to 2,280.72, 3,420.72 and 964.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,280.72 : 3,420.72 = 964.20 : x
2. Step 2: Convert to fraction form
   2,280.72/3,420.72 = 964.20/x
3. Step 3: Cross multiply
   2,280.72x = 3,420.72 × 964.20
4. Step 4: Simplify right side
   2,280.72x = 3,298,258.22
5. Step 5: Solve for x
   x = 3,298,258.22/2,280.72
6. Step 6: Final answer
   x = 1,446.15