Finding the Fourth Proportional to 2,609.78, 3,914.69 and 879.62

Step by Step Solution

1. Step 1: Write the proportion equation
   2,609.78 : 3,914.69 = 879.62 : x
2. Step 2: Convert to fraction form
   2,609.78/3,914.69 = 879.62/x
3. Step 3: Cross multiply
   2,609.78x = 3,914.69 × 879.62
4. Step 4: Simplify right side
   2,609.78x = 3,443,445.01
5. Step 5: Solve for x
   x = 3,443,445.01/2,609.78
6. Step 6: Final answer
   x = 1,319.44