Finding the Fourth Proportional to 2,709.43, 4,061.20 and 1,321.19

Step by Step Solution

1. Step 1: Write the proportion equation
   2,709.43 : 4,061.20 = 1,321.19 : x
2. Step 2: Convert to fraction form
   2,709.43/4,061.20 = 1,321.19/x
3. Step 3: Cross multiply
   2,709.43x = 4,061.20 × 1,321.19
4. Step 4: Simplify right side
   2,709.43x = 5,365,616.83
5. Step 5: Solve for x
   x = 5,365,616.83/2,709.43
6. Step 6: Final answer
   x = 1,980.35