Finding the Fourth Proportional to 2,117.16, 3,171.42 and 1,089

Step by Step Solution

1. Step 1: Write the proportion equation
   2,117.16 : 3,171.42 = 1,089 : x
2. Step 2: Convert to fraction form
   2,117.16/3,171.42 = 1,089/x
3. Step 3: Cross multiply
   2,117.16x = 3,171.42 × 1,089
4. Step 4: Simplify right side
   2,117.16x = 3,453,676.38
5. Step 5: Solve for x
   x = 3,453,676.38/2,117.16
6. Step 6: Final answer
   x = 1,631.28