Finding the Fourth Proportional to 12,900.69, 17,786.25 and 8,355.29

Step by Step Solution

1. Step 1: Write the proportion equation
   12,900.69 : 17,786.25 = 8,355.29 : x
2. Step 2: Convert to fraction form
   12,900.69/17,786.25 = 8,355.29/x
3. Step 3: Cross multiply
   12,900.69x = 17,786.25 × 8,355.29
4. Step 4: Simplify right side
   12,900.69x = 148,609,187.83
5. Step 5: Solve for x
   x = 148,609,187.83/12,900.69
6. Step 6: Final answer
   x = 11,519.48