Finding the Fourth Proportional to 2,215.62, 3,324.96 and 917.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,215.62 : 3,324.96 = 917.10 : x
2. Step 2: Convert to fraction form
   2,215.62/3,324.96 = 917.10/x
3. Step 3: Cross multiply
   2,215.62x = 3,324.96 × 917.10
4. Step 4: Simplify right side
   2,215.62x = 3,049,320.82
5. Step 5: Solve for x
   x = 3,049,320.82/2,215.62
6. Step 6: Final answer
   x = 1,376.28