Finding the Fourth Proportional to 12,843.72, 17,725.20 and 7,255.08

Step by Step Solution

1. Step 1: Write the proportion equation
   12,843.72 : 17,725.20 = 7,255.08 : x
2. Step 2: Convert to fraction form
   12,843.72/17,725.20 = 7,255.08/x
3. Step 3: Cross multiply
   12,843.72x = 17,725.20 × 7,255.08
4. Step 4: Simplify right side
   12,843.72x = 128,597,744.02
5. Step 5: Solve for x
   x = 128,597,744.02/12,843.72
6. Step 6: Final answer
   x = 10,012.50