Finding the Fourth Proportional to 3,086.61, 4,259.76 and 1,891.59

Step by Step Solution

1. Step 1: Write the proportion equation
   3,086.61 : 4,259.76 = 1,891.59 : x
2. Step 2: Convert to fraction form
   3,086.61/4,259.76 = 1,891.59/x
3. Step 3: Cross multiply
   3,086.61x = 4,259.76 × 1,891.59
4. Step 4: Simplify right side
   3,086.61x = 8,057,719.42
5. Step 5: Solve for x
   x = 8,057,719.42/3,086.61
6. Step 6: Final answer
   x = 2,610.54