Finding the Fourth Proportional to 3,078.78, 4,618.98 and 1,131

Step by Step Solution

1. Step 1: Write the proportion equation
   3,078.78 : 4,618.98 = 1,131 : x
2. Step 2: Convert to fraction form
   3,078.78/4,618.98 = 1,131/x
3. Step 3: Cross multiply
   3,078.78x = 4,618.98 × 1,131
4. Step 4: Simplify right side
   3,078.78x = 5,224,066.38
5. Step 5: Solve for x
   x = 5,224,066.38/3,078.78
6. Step 6: Final answer
   x = 1,696.80