Finding the Fourth Proportional to 12,915.29, 17,822.70 and 7,249.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,915.29 : 17,822.70 = 7,249.89 : x
2. Step 2: Convert to fraction form
   12,915.29/17,822.70 = 7,249.89/x
3. Step 3: Cross multiply
   12,915.29x = 17,822.70 × 7,249.89
4. Step 4: Simplify right side
   12,915.29x = 129,212,614.50
5. Step 5: Solve for x
   x = 129,212,614.50/12,915.29
6. Step 6: Final answer
   x = 10,004.62