Finding the Fourth Proportional to 3,431.34, 5,147.61 and 1,091.31

Step by Step Solution

1. Step 1: Write the proportion equation
   3,431.34 : 5,147.61 = 1,091.31 : x
2. Step 2: Convert to fraction form
   3,431.34/5,147.61 = 1,091.31/x
3. Step 3: Cross multiply
   3,431.34x = 5,147.61 × 1,091.31
4. Step 4: Simplify right side
   3,431.34x = 5,617,638.27
5. Step 5: Solve for x
   x = 5,617,638.27/3,431.34
6. Step 6: Final answer
   x = 1,637.16