Finding the Fourth Proportional to 3,439.80, 5,160.42 and 1,131

Step by Step Solution

1. Step 1: Write the proportion equation
   3,439.80 : 5,160.42 = 1,131 : x
2. Step 2: Convert to fraction form
   3,439.80/5,160.42 = 1,131/x
3. Step 3: Cross multiply
   3,439.80x = 5,160.42 × 1,131
4. Step 4: Simplify right side
   3,439.80x = 5,836,435.02
5. Step 5: Solve for x
   x = 5,836,435.02/3,439.80
6. Step 6: Final answer
   x = 1,696.74