Finding the Fourth Proportional to 2,439.10, 3,365.99 and 1,320.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,439.10 : 3,365.99 = 1,320.06 : x
2. Step 2: Convert to fraction form
   2,439.10/3,365.99 = 1,320.06/x
3. Step 3: Cross multiply
   2,439.10x = 3,365.99 × 1,320.06
4. Step 4: Simplify right side
   2,439.10x = 4,443,302.16
5. Step 5: Solve for x
   x = 4,443,302.16/2,439.10
6. Step 6: Final answer
   x = 1,821.70