Finding the Fourth Proportional to 2,610.97, 3,916.62 and 856.15

Step by Step Solution

1. Step 1: Write the proportion equation
   2,610.97 : 3,916.62 = 856.15 : x
2. Step 2: Convert to fraction form
   2,610.97/3,916.62 = 856.15/x
3. Step 3: Cross multiply
   2,610.97x = 3,916.62 × 856.15
4. Step 4: Simplify right side
   2,610.97x = 3,353,215.90
5. Step 5: Solve for x
   x = 3,353,215.90/2,610.97
6. Step 6: Final answer
   x = 1,284.28