Finding the Fourth Proportional to 2,169.78, 2,994.24 and 1,238.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,169.78 : 2,994.24 = 1,238.28 : x
2. Step 2: Convert to fraction form
   2,169.78/2,994.24 = 1,238.28/x
3. Step 3: Cross multiply
   2,169.78x = 2,994.24 × 1,238.28
4. Step 4: Simplify right side
   2,169.78x = 3,707,707.51
5. Step 5: Solve for x
   x = 3,707,707.51/2,169.78
6. Step 6: Final answer
   x = 1,708.79