Finding the Fourth Proportional to 2,173.33, 2,998.78 and 1,288.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,173.33 : 2,998.78 = 1,288.81 : x
2. Step 2: Convert to fraction form
   2,173.33/2,998.78 = 1,288.81/x
3. Step 3: Cross multiply
   2,173.33x = 2,998.78 × 1,288.81
4. Step 4: Simplify right side
   2,173.33x = 3,864,857.65
5. Step 5: Solve for x
   x = 3,864,857.65/2,173.33
6. Step 6: Final answer
   x = 1,778.31