Finding the Fourth Proportional to 3,439.89, 5,160.24 and 1,131.39

Step by Step Solution

1. Step 1: Write the proportion equation
   3,439.89 : 5,160.24 = 1,131.39 : x
2. Step 2: Convert to fraction form
   3,439.89/5,160.24 = 1,131.39/x
3. Step 3: Cross multiply
   3,439.89x = 5,160.24 × 1,131.39
4. Step 4: Simplify right side
   3,439.89x = 5,838,243.93
5. Step 5: Solve for x
   x = 5,838,243.93/3,439.89
6. Step 6: Final answer
   x = 1,697.22