Finding the Fourth Proportional to 12,441.60, 17,168.76 and 7,725.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,441.60 : 17,168.76 = 7,725.78 : x
2. Step 2: Convert to fraction form
   12,441.60/17,168.76 = 7,725.78/x
3. Step 3: Cross multiply
   12,441.60x = 17,168.76 × 7,725.78
4. Step 4: Simplify right side
   12,441.60x = 132,642,062.63
5. Step 5: Solve for x
   x = 132,642,062.63/12,441.60
6. Step 6: Final answer
   x = 10,661.17