Finding the Fourth Proportional to 1,610.84, 2,222.78 and 912.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,610.84 : 2,222.78 = 912.18 : x
2. Step 2: Convert to fraction form
   1,610.84/2,222.78 = 912.18/x
3. Step 3: Cross multiply
   1,610.84x = 2,222.78 × 912.18
4. Step 4: Simplify right side
   1,610.84x = 2,027,575.46
5. Step 5: Solve for x
   x = 2,027,575.46/1,610.84
6. Step 6: Final answer
   x = 1,258.71