Finding the Fourth Proportional to 12,776.38, 17,621.40 and 8,301.59

Step by Step Solution

1. Step 1: Write the proportion equation
   12,776.38 : 17,621.40 = 8,301.59 : x
2. Step 2: Convert to fraction form
   12,776.38/17,621.40 = 8,301.59/x
3. Step 3: Cross multiply
   12,776.38x = 17,621.40 × 8,301.59
4. Step 4: Simplify right side
   12,776.38x = 146,285,647.13
5. Step 5: Solve for x
   x = 146,285,647.13/12,776.38
6. Step 6: Final answer
   x = 11,449.69