Finding the Fourth Proportional to 12,819.92, 17,691.72 and 7,518.56

Step by Step Solution

1. Step 1: Write the proportion equation
   12,819.92 : 17,691.72 = 7,518.56 : x
2. Step 2: Convert to fraction form
   12,819.92/17,691.72 = 7,518.56/x
3. Step 3: Cross multiply
   12,819.92x = 17,691.72 × 7,518.56
4. Step 4: Simplify right side
   12,819.92x = 133,016,258.32
5. Step 5: Solve for x
   x = 133,016,258.32/12,819.92
6. Step 6: Final answer
   x = 10,375.75