Finding the Fourth Proportional to 2,078.78, 2,868.75 and 1,147.22

Step by Step Solution

1. Step 1: Write the proportion equation
   2,078.78 : 2,868.75 = 1,147.22 : x
2. Step 2: Convert to fraction form
   2,078.78/2,868.75 = 1,147.22/x
3. Step 3: Cross multiply
   2,078.78x = 2,868.75 × 1,147.22
4. Step 4: Simplify right side
   2,078.78x = 3,291,087.38
5. Step 5: Solve for x
   x = 3,291,087.38/2,078.78
6. Step 6: Final answer
   x = 1,583.18