Finding the Fourth Proportional to 2,453.36, 3,385.76 and 1,405.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,453.36 : 3,385.76 = 1,405.40 : x
2. Step 2: Convert to fraction form
   2,453.36/3,385.76 = 1,405.40/x
3. Step 3: Cross multiply
   2,453.36x = 3,385.76 × 1,405.40
4. Step 4: Simplify right side
   2,453.36x = 4,758,323.15
5. Step 5: Solve for x
   x = 4,758,323.15/2,453.36
6. Step 6: Final answer
   x = 1,939.52