Finding the Fourth Proportional to 1,610.01, 2,221.83 and 911.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,610.01 : 2,221.83 = 911.25 : x
2. Step 2: Convert to fraction form
   1,610.01/2,221.83 = 911.25/x
3. Step 3: Cross multiply
   1,610.01x = 2,221.83 × 911.25
4. Step 4: Simplify right side
   1,610.01x = 2,024,642.59
5. Step 5: Solve for x
   x = 2,024,642.59/1,610.01
6. Step 6: Final answer
   x = 1,257.53