Finding the Fourth Proportional to 3,385.73, 5,078.72 and 920.62

Step by Step Solution

1. Step 1: Write the proportion equation
   3,385.73 : 5,078.72 = 920.62 : x
2. Step 2: Convert to fraction form
   3,385.73/5,078.72 = 920.62/x
3. Step 3: Cross multiply
   3,385.73x = 5,078.72 × 920.62
4. Step 4: Simplify right side
   3,385.73x = 4,675,579.86
5. Step 5: Solve for x
   x = 4,675,579.86/3,385.73
6. Step 6: Final answer
   x = 1,380.97