Finding the Fourth Proportional to 19,947.76, 29,916.72 and 13,413.52

Step by Step Solution

1. Step 1: Write the proportion equation
   19,947.76 : 29,916.72 = 13,413.52 : x
2. Step 2: Convert to fraction form
   19,947.76/29,916.72 = 13,413.52/x
3. Step 3: Cross multiply
   19,947.76x = 29,916.72 × 13,413.52
4. Step 4: Simplify right side
   19,947.76x = 401,288,522.05
5. Step 5: Solve for x
   x = 401,288,522.05/19,947.76
6. Step 6: Final answer
   x = 20,116.97