Finding the Fourth Proportional to 2,216.15, 3,324.71 and 917.63

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.15 : 3,324.71 = 917.63 : x
2. Step 2: Convert to fraction form
   2,216.15/3,324.71 = 917.63/x
3. Step 3: Cross multiply
   2,216.15x = 3,324.71 × 917.63
4. Step 4: Simplify right side
   2,216.15x = 3,050,839.31
5. Step 5: Solve for x
   x = 3,050,839.31/2,216.15
6. Step 6: Final answer
   x = 1,376.64