Finding the Fourth Proportional to 2,211.63, 3,315.83 and 912.39

Step by Step Solution

1. Step 1: Write the proportion equation
   2,211.63 : 3,315.83 = 912.39 : x
2. Step 2: Convert to fraction form
   2,211.63/3,315.83 = 912.39/x
3. Step 3: Cross multiply
   2,211.63x = 3,315.83 × 912.39
4. Step 4: Simplify right side
   2,211.63x = 3,025,325.57
5. Step 5: Solve for x
   x = 3,025,325.57/2,211.63
6. Step 6: Final answer
   x = 1,367.92