Finding the Fourth Proportional to 2,200.80, 3,301.82 and 903.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,200.80 : 3,301.82 = 903.20 : x
2. Step 2: Convert to fraction form
   2,200.80/3,301.82 = 903.20/x
3. Step 3: Cross multiply
   2,200.80x = 3,301.82 × 903.20
4. Step 4: Simplify right side
   2,200.80x = 2,982,203.82
5. Step 5: Solve for x
   x = 2,982,203.82/2,200.80
6. Step 6: Final answer
   x = 1,355.05