Finding the Fourth Proportional to 2,168.78, 2,987.78 and 1,788.19

Step by Step Solution

1. Step 1: Write the proportion equation
   2,168.78 : 2,987.78 = 1,788.19 : x
2. Step 2: Convert to fraction form
   2,168.78/2,987.78 = 1,788.19/x
3. Step 3: Cross multiply
   2,168.78x = 2,987.78 × 1,788.19
4. Step 4: Simplify right side
   2,168.78x = 5,342,705.46
5. Step 5: Solve for x
   x = 5,342,705.46/2,168.78
6. Step 6: Final answer
   x = 2,463.47