Finding the Fourth Proportional to 21,191.56, 31,788.86 and 5,609

Step by Step Solution

1. Step 1: Write the proportion equation
   21,191.56 : 31,788.86 = 5,609 : x
2. Step 2: Convert to fraction form
   21,191.56/31,788.86 = 5,609/x
3. Step 3: Cross multiply
   21,191.56x = 31,788.86 × 5,609
4. Step 4: Simplify right side
   21,191.56x = 178,303,715.74
5. Step 5: Solve for x
   x = 178,303,715.74/21,191.56
6. Step 6: Final answer
   x = 8,413.90