Finding the Fourth Proportional to 1,610.58, 2,221.95 and 911.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,610.58 : 2,221.95 = 911.82 : x
2. Step 2: Convert to fraction form
   1,610.58/2,221.95 = 911.82/x
3. Step 3: Cross multiply
   1,610.58x = 2,221.95 × 911.82
4. Step 4: Simplify right side
   1,610.58x = 2,026,018.45
5. Step 5: Solve for x
   x = 2,026,018.45/1,610.58
6. Step 6: Final answer
   x = 1,257.94