Finding the Fourth Proportional to 12,819.72, 17,691.89 and 7,516.25

Step by Step Solution

1. Step 1: Write the proportion equation
   12,819.72 : 17,691.89 = 7,516.25 : x
2. Step 2: Convert to fraction form
   12,819.72/17,691.89 = 7,516.25/x
3. Step 3: Cross multiply
   12,819.72x = 17,691.89 × 7,516.25
4. Step 4: Simplify right side
   12,819.72x = 132,976,668.21
5. Step 5: Solve for x
   x = 132,976,668.21/12,819.72
6. Step 6: Final answer
   x = 10,372.82