Finding the Fourth Proportional to 1,738.40, 2,399.32 and 1,039.60

Step by Step Solution

1. Step 1: Write the proportion equation
   1,738.40 : 2,399.32 = 1,039.60 : x
2. Step 2: Convert to fraction form
   1,738.40/2,399.32 = 1,039.60/x
3. Step 3: Cross multiply
   1,738.40x = 2,399.32 × 1,039.60
4. Step 4: Simplify right side
   1,738.40x = 2,494,333.07
5. Step 5: Solve for x
   x = 2,494,333.07/1,738.40
6. Step 6: Final answer
   x = 1,434.84