Finding the Fourth Proportional to 9,072.88, 12,520.51 and 5,717.86

Step by Step Solution

1. Step 1: Write the proportion equation
   9,072.88 : 12,520.51 = 5,717.86 : x
2. Step 2: Convert to fraction form
   9,072.88/12,520.51 = 5,717.86/x
3. Step 3: Cross multiply
   9,072.88x = 12,520.51 × 5,717.86
4. Step 4: Simplify right side
   9,072.88x = 71,590,523.31
5. Step 5: Solve for x
   x = 71,590,523.31/9,072.88
6. Step 6: Final answer
   x = 7,890.61