Finding the Fourth Proportional to 16,580.78, 22,877.77 and 9,507.20

Step by Step Solution

1. Step 1: Write the proportion equation
   16,580.78 : 22,877.77 = 9,507.20 : x
2. Step 2: Convert to fraction form
   16,580.78/22,877.77 = 9,507.20/x
3. Step 3: Cross multiply
   16,580.78x = 22,877.77 × 9,507.20
4. Step 4: Simplify right side
   16,580.78x = 217,503,452.22
5. Step 5: Solve for x
   x = 217,503,452.22/16,580.78
6. Step 6: Final answer
   x = 13,117.81