Finding the Fourth Proportional to 2,170.89, 2,995.83 and 1,287.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,170.89 : 2,995.83 = 1,287.12 : x
2. Step 2: Convert to fraction form
   2,170.89/2,995.83 = 1,287.12/x
3. Step 3: Cross multiply
   2,170.89x = 2,995.83 × 1,287.12
4. Step 4: Simplify right side
   2,170.89x = 3,855,992.71
5. Step 5: Solve for x
   x = 3,855,992.71/2,170.89
6. Step 6: Final answer
   x = 1,776.23