Finding the Fourth Proportional to 2,405.91, 3,320.25 and 1,329.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,405.91 : 3,320.25 = 1,329.20 : x
2. Step 2: Convert to fraction form
   2,405.91/3,320.25 = 1,329.20/x
3. Step 3: Cross multiply
   2,405.91x = 3,320.25 × 1,329.20
4. Step 4: Simplify right side
   2,405.91x = 4,413,267.17
5. Step 5: Solve for x
   x = 4,413,267.17/2,405.91
6. Step 6: Final answer
   x = 1,834.34