Finding the Fourth Proportional to 13,312.09, 19,964.71 and 3,949.89

Step by Step Solution

1. Step 1: Write the proportion equation
   13,312.09 : 19,964.71 = 3,949.89 : x
2. Step 2: Convert to fraction form
   13,312.09/19,964.71 = 3,949.89/x
3. Step 3: Cross multiply
   13,312.09x = 19,964.71 × 3,949.89
4. Step 4: Simplify right side
   13,312.09x = 78,858,413.32
5. Step 5: Solve for x
   x = 78,858,413.32/13,312.09
6. Step 6: Final answer
   x = 5,923.82