Finding the Fourth Proportional to 2,229.25, 3,345.15 and 912.79

Step by Step Solution

1. Step 1: Write the proportion equation
   2,229.25 : 3,345.15 = 912.79 : x
2. Step 2: Convert to fraction form
   2,229.25/3,345.15 = 912.79/x
3. Step 3: Cross multiply
   2,229.25x = 3,345.15 × 912.79
4. Step 4: Simplify right side
   2,229.25x = 3,053,419.47
5. Step 5: Solve for x
   x = 3,053,419.47/2,229.25
6. Step 6: Final answer
   x = 1,369.71