Finding the Fourth Proportional to 12,815.51, 17,696.53 and 8,043.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,815.51 : 17,696.53 = 8,043.72 : x
2. Step 2: Convert to fraction form
   12,815.51/17,696.53 = 8,043.72/x
3. Step 3: Cross multiply
   12,815.51x = 17,696.53 × 8,043.72
4. Step 4: Simplify right side
   12,815.51x = 142,345,993.63
5. Step 5: Solve for x
   x = 142,345,993.63/12,815.51
6. Step 6: Final answer
   x = 11,107.32