Finding the Fourth Proportional to 1,610.91, 2,223.06 and 912.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,610.91 : 2,223.06 = 912.29 : x
2. Step 2: Convert to fraction form
   1,610.91/2,223.06 = 912.29/x
3. Step 3: Cross multiply
   1,610.91x = 2,223.06 × 912.29
4. Step 4: Simplify right side
   1,610.91x = 2,028,064.29
5. Step 5: Solve for x
   x = 2,028,064.29/1,610.91
6. Step 6: Final answer
   x = 1,258.96