Finding the Fourth Proportional to 2,215.57, 3,323.77 and 917.14

Step by Step Solution

1. Step 1: Write the proportion equation
   2,215.57 : 3,323.77 = 917.14 : x
2. Step 2: Convert to fraction form
   2,215.57/3,323.77 = 917.14/x
3. Step 3: Cross multiply
   2,215.57x = 3,323.77 × 917.14
4. Step 4: Simplify right side
   2,215.57x = 3,048,357.83
5. Step 5: Solve for x
   x = 3,048,357.83/2,215.57
6. Step 6: Final answer
   x = 1,375.88