Finding the Fourth Proportional to 3,915.18, 5,413.32 and 3,423.12

Step by Step Solution

1. Step 1: Write the proportion equation
   3,915.18 : 5,413.32 = 3,423.12 : x
2. Step 2: Convert to fraction form
   3,915.18/5,413.32 = 3,423.12/x
3. Step 3: Cross multiply
   3,915.18x = 5,413.32 × 3,423.12
4. Step 4: Simplify right side
   3,915.18x = 18,530,443.96
5. Step 5: Solve for x
   x = 18,530,443.96/3,915.18
6. Step 6: Final answer
   x = 4,732.97