Finding the Fourth Proportional to 2,168.78, 3,254.78 and 1,619.30

Step by Step Solution

1. Step 1: Write the proportion equation
   2,168.78 : 3,254.78 = 1,619.30 : x
2. Step 2: Convert to fraction form
   2,168.78/3,254.78 = 1,619.30/x
3. Step 3: Cross multiply
   2,168.78x = 3,254.78 × 1,619.30
4. Step 4: Simplify right side
   2,168.78x = 5,270,465.25
5. Step 5: Solve for x
   x = 5,270,465.25/2,168.78
6. Step 6: Final answer
   x = 2,430.15