Finding the Fourth Proportional to 3,429.78, 5,145.39 and 1,089.47

Step by Step Solution

1. Step 1: Write the proportion equation
   3,429.78 : 5,145.39 = 1,089.47 : x
2. Step 2: Convert to fraction form
   3,429.78/5,145.39 = 1,089.47/x
3. Step 3: Cross multiply
   3,429.78x = 5,145.39 × 1,089.47
4. Step 4: Simplify right side
   3,429.78x = 5,605,731.96
5. Step 5: Solve for x
   x = 5,605,731.96/3,429.78
6. Step 6: Final answer
   x = 1,634.43