Finding the Fourth Proportional to 3,385.42, 5,078.42 and 920.24

Step by Step Solution

1. Step 1: Write the proportion equation
   3,385.42 : 5,078.42 = 920.24 : x
2. Step 2: Convert to fraction form
   3,385.42/5,078.42 = 920.24/x
3. Step 3: Cross multiply
   3,385.42x = 5,078.42 × 920.24
4. Step 4: Simplify right side
   3,385.42x = 4,673,365.22
5. Step 5: Solve for x
   x = 4,673,365.22/3,385.42
6. Step 6: Final answer
   x = 1,380.44