Finding the Fourth Proportional to 2,517.78, 3,779.41 and 1,908.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,517.78 : 3,779.41 = 1,908.16 : x
2. Step 2: Convert to fraction form
   2,517.78/3,779.41 = 1,908.16/x
3. Step 3: Cross multiply
   2,517.78x = 3,779.41 × 1,908.16
4. Step 4: Simplify right side
   2,517.78x = 7,211,708.34
5. Step 5: Solve for x
   x = 7,211,708.34/2,517.78
6. Step 6: Final answer
   x = 2,864.31