Finding the Fourth Proportional to 2,610.76, 3,910.20 and 1,312.60

Step by Step Solution

1. Step 1: Write the proportion equation
   2,610.76 : 3,910.20 = 1,312.60 : x
2. Step 2: Convert to fraction form
   2,610.76/3,910.20 = 1,312.60/x
3. Step 3: Cross multiply
   2,610.76x = 3,910.20 × 1,312.60
4. Step 4: Simplify right side
   2,610.76x = 5,132,528.52
5. Step 5: Solve for x
   x = 5,132,528.52/2,610.76
6. Step 6: Final answer
   x = 1,965.91