Finding the Fourth Proportional to 2,171.13, 2,996.18 and 1,287.37

Step by Step Solution

1. Step 1: Write the proportion equation
   2,171.13 : 2,996.18 = 1,287.37 : x
2. Step 2: Convert to fraction form
   2,171.13/2,996.18 = 1,287.37/x
3. Step 3: Cross multiply
   2,171.13x = 2,996.18 × 1,287.37
4. Step 4: Simplify right side
   2,171.13x = 3,857,192.25
5. Step 5: Solve for x
   x = 3,857,192.25/2,171.13
6. Step 6: Final answer
   x = 1,776.58