Finding the Fourth Proportional to 3,757.55, 5,185.11 and 2,078.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,757.55 : 5,185.11 = 2,078.78 : x
2. Step 2: Convert to fraction form
   3,757.55/5,185.11 = 2,078.78/x
3. Step 3: Cross multiply
   3,757.55x = 5,185.11 × 2,078.78
4. Step 4: Simplify right side
   3,757.55x = 10,778,677.04
5. Step 5: Solve for x
   x = 10,778,677.04/3,757.55
6. Step 6: Final answer
   x = 2,868.54