Finding the Fourth Proportional to 2,190.38, 3,022.79 and 1,258.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,190.38 : 3,022.79 = 1,258.88 : x
2. Step 2: Convert to fraction form
   2,190.38/3,022.79 = 1,258.88/x
3. Step 3: Cross multiply
   2,190.38x = 3,022.79 × 1,258.88
4. Step 4: Simplify right side
   2,190.38x = 3,805,308.47
5. Step 5: Solve for x
   x = 3,805,308.47/2,190.38
6. Step 6: Final answer
   x = 1,737.29