Finding the Fourth Proportional to 12,786.84, 17,645.46 and 7,197.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,786.84 : 17,645.46 = 7,197.72 : x
2. Step 2: Convert to fraction form
   12,786.84/17,645.46 = 7,197.72/x
3. Step 3: Cross multiply
   12,786.84x = 17,645.46 × 7,197.72
4. Step 4: Simplify right side
   12,786.84x = 127,007,080.35
5. Step 5: Solve for x
   x = 127,007,080.35/12,786.84
6. Step 6: Final answer
   x = 9,932.64