Finding the Fourth Proportional to 12,786.66, 17,648.21 and 7,482.78

Step by Step Solution

1. Step 1: Write the proportion equation
   12,786.66 : 17,648.21 = 7,482.78 : x
2. Step 2: Convert to fraction form
   12,786.66/17,648.21 = 7,482.78/x
3. Step 3: Cross multiply
   12,786.66x = 17,648.21 × 7,482.78
4. Step 4: Simplify right side
   12,786.66x = 132,057,691.53
5. Step 5: Solve for x
   x = 132,057,691.53/12,786.66
6. Step 6: Final answer
   x = 10,327.77