Finding the Fourth Proportional to 3,818.78, 5,262.78 and 2,978.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,818.78 : 5,262.78 = 2,978.15 : x
2. Step 2: Convert to fraction form
   3,818.78/5,262.78 = 2,978.15/x
3. Step 3: Cross multiply
   3,818.78x = 5,262.78 × 2,978.15
4. Step 4: Simplify right side
   3,818.78x = 15,673,333.37
5. Step 5: Solve for x
   x = 15,673,333.37/3,818.78
6. Step 6: Final answer
   x = 4,104.28