Finding the Fourth Proportional to 2,605.82, 3,891.69 and 2,086.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,605.82 : 3,891.69 = 2,086.61 : x
2. Step 2: Convert to fraction form
   2,605.82/3,891.69 = 2,086.61/x
3. Step 3: Cross multiply
   2,605.82x = 3,891.69 × 2,086.61
4. Step 4: Simplify right side
   2,605.82x = 8,120,419.81
5. Step 5: Solve for x
   x = 8,120,419.81/2,605.82
6. Step 6: Final answer
   x = 3,116.27