Finding the Fourth Proportional to 2,610.24, 3,915.72 and 879.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,610.24 : 3,915.72 = 879.12 : x
2. Step 2: Convert to fraction form
   2,610.24/3,915.72 = 879.12/x
3. Step 3: Cross multiply
   2,610.24x = 3,915.72 × 879.12
4. Step 4: Simplify right side
   2,610.24x = 3,442,387.77
5. Step 5: Solve for x
   x = 3,442,387.77/2,610.24
6. Step 6: Final answer
   x = 1,318.80