Finding the Fourth Proportional to 12,815.80, 17,659.56 and 9,453.30

Step by Step Solution

1. Step 1: Write the proportion equation
   12,815.80 : 17,659.56 = 9,453.30 : x
2. Step 2: Convert to fraction form
   12,815.80/17,659.56 = 9,453.30/x
3. Step 3: Cross multiply
   12,815.80x = 17,659.56 × 9,453.30
4. Step 4: Simplify right side
   12,815.80x = 166,941,118.55
5. Step 5: Solve for x
   x = 166,941,118.55/12,815.80
6. Step 6: Final answer
   x = 13,026.20