Finding the Fourth Proportional to 1,396.70, 2,104.86 and 1,258.05

Step by Step Solution

1. Step 1: Write the proportion equation
   1,396.70 : 2,104.86 = 1,258.05 : x
2. Step 2: Convert to fraction form
   1,396.70/2,104.86 = 1,258.05/x
3. Step 3: Cross multiply
   1,396.70x = 2,104.86 × 1,258.05
4. Step 4: Simplify right side
   1,396.70x = 2,648,019.12
5. Step 5: Solve for x
   x = 2,648,019.12/1,396.70
6. Step 6: Final answer
   x = 1,895.91