Finding the Fourth Proportional to 2,627.10, 3,940.80 and 679.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,627.10 : 3,940.80 = 679.31 : x
2. Step 2: Convert to fraction form
   2,627.10/3,940.80 = 679.31/x
3. Step 3: Cross multiply
   2,627.10x = 3,940.80 × 679.31
4. Step 4: Simplify right side
   2,627.10x = 2,677,005.14
5. Step 5: Solve for x
   x = 2,677,005.14/2,627.10
6. Step 6: Final answer
   x = 1,019.00