Finding the Fourth Proportional to 2,145.08, 3,214.89 and 912.16

Step by Step Solution

1. Step 1: Write the proportion equation
   2,145.08 : 3,214.89 = 912.16 : x
2. Step 2: Convert to fraction form
   2,145.08/3,214.89 = 912.16/x
3. Step 3: Cross multiply
   2,145.08x = 3,214.89 × 912.16
4. Step 4: Simplify right side
   2,145.08x = 2,932,498.08
5. Step 5: Solve for x
   x = 2,932,498.08/2,145.08
6. Step 6: Final answer
   x = 1,367.08