Finding the Fourth Proportional to 2,610.12, 3,912.66 and 877.50

Step by Step Solution

1. Step 1: Write the proportion equation
   2,610.12 : 3,912.66 = 877.50 : x
2. Step 2: Convert to fraction form
   2,610.12/3,912.66 = 877.50/x
3. Step 3: Cross multiply
   2,610.12x = 3,912.66 × 877.50
4. Step 4: Simplify right side
   2,610.12x = 3,433,359.15
5. Step 5: Solve for x
   x = 3,433,359.15/2,610.12
6. Step 6: Final answer
   x = 1,315.40