Finding the Fourth Proportional to 3,429.88, 5,145.26 and 1,089.05

Step by Step Solution

1. Step 1: Write the proportion equation
   3,429.88 : 5,145.26 = 1,089.05 : x
2. Step 2: Convert to fraction form
   3,429.88/5,145.26 = 1,089.05/x
3. Step 3: Cross multiply
   3,429.88x = 5,145.26 × 1,089.05
4. Step 4: Simplify right side
   3,429.88x = 5,603,451.39
5. Step 5: Solve for x
   x = 5,603,451.39/3,429.88
6. Step 6: Final answer
   x = 1,633.72