Finding the Fourth Proportional to 1,658.15, 2,288.35 and 912.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,658.15 : 2,288.35 = 912.18 : x
2. Step 2: Convert to fraction form
   1,658.15/2,288.35 = 912.18/x
3. Step 3: Cross multiply
   1,658.15x = 2,288.35 × 912.18
4. Step 4: Simplify right side
   1,658.15x = 2,087,387.10
5. Step 5: Solve for x
   x = 2,087,387.10/1,658.15
6. Step 6: Final answer
   x = 1,258.87