Finding the Fourth Proportional to 2,574.15, 3,861.09 and 1,405.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,574.15 : 3,861.09 = 1,405.05 : x
2. Step 2: Convert to fraction form
   2,574.15/3,861.09 = 1,405.05/x
3. Step 3: Cross multiply
   2,574.15x = 3,861.09 × 1,405.05
4. Step 4: Simplify right side
   2,574.15x = 5,425,024.50
5. Step 5: Solve for x
   x = 5,425,024.50/2,574.15
6. Step 6: Final answer
   x = 2,107.50