Finding the Fourth Proportional to 2,272.89, 3,407.04 and 811.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,272.89 : 3,407.04 = 811.25 : x
2. Step 2: Convert to fraction form
   2,272.89/3,407.04 = 811.25/x
3. Step 3: Cross multiply
   2,272.89x = 3,407.04 × 811.25
4. Step 4: Simplify right side
   2,272.89x = 2,763,944.16
5. Step 5: Solve for x
   x = 2,763,944.16/2,272.89
6. Step 6: Final answer
   x = 1,216.05