Finding the Fourth Proportional to 2,610.81, 3,915.57 and 879.42

Step by Step Solution

1. Step 1: Write the proportion equation
   2,610.81 : 3,915.57 = 879.42 : x
2. Step 2: Convert to fraction form
   2,610.81/3,915.57 = 879.42/x
3. Step 3: Cross multiply
   2,610.81x = 3,915.57 × 879.42
4. Step 4: Simplify right side
   2,610.81x = 3,443,430.57
5. Step 5: Solve for x
   x = 3,443,430.57/2,610.81
6. Step 6: Final answer
   x = 1,318.91