Finding the Fourth Proportional to 1,610.88, 2,223.31 and 912.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,610.88 : 2,223.31 = 912.25 : x
2. Step 2: Convert to fraction form
   1,610.88/2,223.31 = 912.25/x
3. Step 3: Cross multiply
   1,610.88x = 2,223.31 × 912.25
4. Step 4: Simplify right side
   1,610.88x = 2,028,214.55
5. Step 5: Solve for x
   x = 2,028,214.55/1,610.88
6. Step 6: Final answer
   x = 1,259.07