Finding the Fourth Proportional to 3,429.39, 5,145.36 and 1,120.89

Step by Step Solution

1. Step 1: Write the proportion equation
   3,429.39 : 5,145.36 = 1,120.89 : x
2. Step 2: Convert to fraction form
   3,429.39/5,145.36 = 1,120.89/x
3. Step 3: Cross multiply
   3,429.39x = 5,145.36 × 1,120.89
4. Step 4: Simplify right side
   3,429.39x = 5,767,382.57
5. Step 5: Solve for x
   x = 5,767,382.57/3,429.39
6. Step 6: Final answer
   x = 1,681.75