Finding the Fourth Proportional to 3,520.18, 5,280.34 and 923.20

Step by Step Solution

1. Step 1: Write the proportion equation
   3,520.18 : 5,280.34 = 923.20 : x
2. Step 2: Convert to fraction form
   3,520.18/5,280.34 = 923.20/x
3. Step 3: Cross multiply
   3,520.18x = 5,280.34 × 923.20
4. Step 4: Simplify right side
   3,520.18x = 4,874,809.89
5. Step 5: Solve for x
   x = 4,874,809.89/3,520.18
6. Step 6: Final answer
   x = 1,384.82