Finding the Fourth Proportional to 2,680.35, 4,018.22 and 1,291.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,680.35 : 4,018.22 = 1,291.78 : x
2. Step 2: Convert to fraction form
   2,680.35/4,018.22 = 1,291.78/x
3. Step 3: Cross multiply
   2,680.35x = 4,018.22 × 1,291.78
4. Step 4: Simplify right side
   2,680.35x = 5,190,656.23
5. Step 5: Solve for x
   x = 5,190,656.23/2,680.35
6. Step 6: Final answer
   x = 1,936.56