Finding the Fourth Proportional to 12,558.72, 17,333.43 and 8,309.87

Step by Step Solution

1. Step 1: Write the proportion equation
   12,558.72 : 17,333.43 = 8,309.87 : x
2. Step 2: Convert to fraction form
   12,558.72/17,333.43 = 8,309.87/x
3. Step 3: Cross multiply
   12,558.72x = 17,333.43 × 8,309.87
4. Step 4: Simplify right side
   12,558.72x = 144,038,463.29
5. Step 5: Solve for x
   x = 144,038,463.29/12,558.72
6. Step 6: Final answer
   x = 11,469.20