Finding the Fourth Proportional to 1,658.27, 2,288.35 and 912.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,658.27 : 2,288.35 = 912.20 : x
2. Step 2: Convert to fraction form
   1,658.27/2,288.35 = 912.20/x
3. Step 3: Cross multiply
   1,658.27x = 2,288.35 × 912.20
4. Step 4: Simplify right side
   1,658.27x = 2,087,422.57
5. Step 5: Solve for x
   x = 2,087,422.57/1,658.27
6. Step 6: Final answer
   x = 1,258.79