Finding the Fourth Proportional to 2,216.79, 3,325.46 and 919.17

Step by Step Solution

1. Step 1: Write the proportion equation
   2,216.79 : 3,325.46 = 919.17 : x
2. Step 2: Convert to fraction form
   2,216.79/3,325.46 = 919.17/x
3. Step 3: Cross multiply
   2,216.79x = 3,325.46 × 919.17
4. Step 4: Simplify right side
   2,216.79x = 3,056,658.47
5. Step 5: Solve for x
   x = 3,056,658.47/2,216.79
6. Step 6: Final answer
   x = 1,378.87