Finding the Fourth Proportional to 2,118.62, 3,171.33 and 1,142.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,118.62 : 3,171.33 = 1,142.30 : x
2. Step 2: Convert to fraction form
   2,118.62/3,171.33 = 1,142.30/x
3. Step 3: Cross multiply
   2,118.62x = 3,171.33 × 1,142.30
4. Step 4: Simplify right side
   2,118.62x = 3,622,610.26
5. Step 5: Solve for x
   x = 3,622,610.26/2,118.62
6. Step 6: Final answer
   x = 1,709.89