Finding the Fourth Proportional to 12,819.52, 17,691.20 and 7,230.48

Step by Step Solution

1. Step 1: Write the proportion equation
   12,819.52 : 17,691.20 = 7,230.48 : x
2. Step 2: Convert to fraction form
   12,819.52/17,691.20 = 7,230.48/x
3. Step 3: Cross multiply
   12,819.52x = 17,691.20 × 7,230.48
4. Step 4: Simplify right side
   12,819.52x = 127,915,867.78
5. Step 5: Solve for x
   x = 127,915,867.78/12,819.52
6. Step 6: Final answer
   x = 9,978.21