Finding the Fourth Proportional to 2,171.38, 2,996.52 and 1,287.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,171.38 : 2,996.52 = 1,287.62 : x
2. Step 2: Convert to fraction form
   2,171.38/2,996.52 = 1,287.62/x
3. Step 3: Cross multiply
   2,171.38x = 2,996.52 × 1,287.62
4. Step 4: Simplify right side
   2,171.38x = 3,858,379.08
5. Step 5: Solve for x
   x = 3,858,379.08/2,171.38
6. Step 6: Final answer
   x = 1,776.92