Finding the Fourth Proportional to 15,091.89, 20,825.83 and 8,377.20

Step by Step Solution

1. Step 1: Write the proportion equation
   15,091.89 : 20,825.83 = 8,377.20 : x
2. Step 2: Convert to fraction form
   15,091.89/20,825.83 = 8,377.20/x
3. Step 3: Cross multiply
   15,091.89x = 20,825.83 × 8,377.20
4. Step 4: Simplify right side
   15,091.89x = 174,462,143.08
5. Step 5: Solve for x
   x = 174,462,143.08/15,091.89
6. Step 6: Final answer
   x = 11,559.99