Finding the Fourth Proportional to 2,218.53, 3,328.17 and 920.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,218.53 : 3,328.17 = 920.10 : x
2. Step 2: Convert to fraction form
   2,218.53/3,328.17 = 920.10/x
3. Step 3: Cross multiply
   2,218.53x = 3,328.17 × 920.10
4. Step 4: Simplify right side
   2,218.53x = 3,062,249.22
5. Step 5: Solve for x
   x = 3,062,249.22/2,218.53
6. Step 6: Final answer
   x = 1,380.31