Finding the Fourth Proportional to 2,453.74, 3,386.34 and 1,405.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,453.74 : 3,386.34 = 1,405.78 : x
2. Step 2: Convert to fraction form
   2,453.74/3,386.34 = 1,405.78/x
3. Step 3: Cross multiply
   2,453.74x = 3,386.34 × 1,405.78
4. Step 4: Simplify right side
   2,453.74x = 4,760,449.05
5. Step 5: Solve for x
   x = 4,760,449.05/2,453.74
6. Step 6: Final answer
   x = 1,940.08