Finding the Fourth Proportional to 1,990.28, 2,983.86 and 1,258.32

Step by Step Solution

1. Step 1: Write the proportion equation
   1,990.28 : 2,983.86 = 1,258.32 : x
2. Step 2: Convert to fraction form
   1,990.28/2,983.86 = 1,258.32/x
3. Step 3: Cross multiply
   1,990.28x = 2,983.86 × 1,258.32
4. Step 4: Simplify right side
   1,990.28x = 3,754,650.72
5. Step 5: Solve for x
   x = 3,754,650.72/1,990.28
6. Step 6: Final answer
   x = 1,886.49