Finding the Fourth Proportional to 2,439.10, 3,365.96 and 1,320.03

Step by Step Solution

1. Step 1: Write the proportion equation
   2,439.10 : 3,365.96 = 1,320.03 : x
2. Step 2: Convert to fraction form
   2,439.10/3,365.96 = 1,320.03/x
3. Step 3: Cross multiply
   2,439.10x = 3,365.96 × 1,320.03
4. Step 4: Simplify right side
   2,439.10x = 4,443,178.47
5. Step 5: Solve for x
   x = 4,443,178.47/2,439.10
6. Step 6: Final answer
   x = 1,821.65