Finding the Fourth Proportional to 1,405.74, 1,940.47 and 1,258.12

Step by Step Solution

1. Step 1: Write the proportion equation
   1,405.74 : 1,940.47 = 1,258.12 : x
2. Step 2: Convert to fraction form
   1,405.74/1,940.47 = 1,258.12/x
3. Step 3: Cross multiply
   1,405.74x = 1,940.47 × 1,258.12
4. Step 4: Simplify right side
   1,405.74x = 2,441,350.47
5. Step 5: Solve for x
   x = 2,441,350.47/1,405.74
6. Step 6: Final answer
   x = 1,736.70