Finding the Fourth Proportional to 12,786.89, 17,641.68 and 7,477.95

Step by Step Solution

1. Step 1: Write the proportion equation
   12,786.89 : 17,641.68 = 7,477.95 : x
2. Step 2: Convert to fraction form
   12,786.89/17,641.68 = 7,477.95/x
3. Step 3: Cross multiply
   12,786.89x = 17,641.68 × 7,477.95
4. Step 4: Simplify right side
   12,786.89x = 131,923,600.96
5. Step 5: Solve for x
   x = 131,923,600.96/12,786.89
6. Step 6: Final answer
   x = 10,317.10