Finding the Fourth Proportional to 1,610.76, 2,222.88 and 912.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,610.76 : 2,222.88 = 912.18 : x
2. Step 2: Convert to fraction form
   1,610.76/2,222.88 = 912.18/x
3. Step 3: Cross multiply
   1,610.76x = 2,222.88 × 912.18
4. Step 4: Simplify right side
   1,610.76x = 2,027,666.68
5. Step 5: Solve for x
   x = 2,027,666.68/1,610.76
6. Step 6: Final answer
   x = 1,258.83