Finding the Fourth Proportional to 12,308.93, 16,991.81 and 9,577.27

Step by Step Solution

1. Step 1: Write the proportion equation
   12,308.93 : 16,991.81 = 9,577.27 : x
2. Step 2: Convert to fraction form
   12,308.93/16,991.81 = 9,577.27/x
3. Step 3: Cross multiply
   12,308.93x = 16,991.81 × 9,577.27
4. Step 4: Simplify right side
   12,308.93x = 162,735,161.43
5. Step 5: Solve for x
   x = 162,735,161.43/12,308.93
6. Step 6: Final answer
   x = 13,220.90