Finding the Fourth Proportional to 1,610.28, 2,221.83 and 911.61

Step by Step Solution

1. Step 1: Write the proportion equation
   1,610.28 : 2,221.83 = 911.61 : x
2. Step 2: Convert to fraction form
   1,610.28/2,221.83 = 911.61/x
3. Step 3: Cross multiply
   1,610.28x = 2,221.83 × 911.61
4. Step 4: Simplify right side
   1,610.28x = 2,025,442.45
5. Step 5: Solve for x
   x = 2,025,442.45/1,610.28
6. Step 6: Final answer
   x = 1,257.82