Finding the Fourth Proportional to 3,871.59, 5,808.59 and 1,405.74

Step by Step Solution

1. Step 1: Write the proportion equation
   3,871.59 : 5,808.59 = 1,405.74 : x
2. Step 2: Convert to fraction form
   3,871.59/5,808.59 = 1,405.74/x
3. Step 3: Cross multiply
   3,871.59x = 5,808.59 × 1,405.74
4. Step 4: Simplify right side
   3,871.59x = 8,165,367.31
5. Step 5: Solve for x
   x = 8,165,367.31/3,871.59
6. Step 6: Final answer
   x = 2,109.05